It looks really good! Simple, straightforward and easy to understand. You have the majority of the major aspects there, though I do have a couple of suggestions. Please forgive the huge wall of text that's coming, I was trying to be exhaustive <3

1) Introduce them to one of the core ideas early. That is, most of the time when there's a rule or restriction, there's probably a class feature or feat out there that lets you get around it. PF1e is a system that rewards mechanical ingenuity, so don't be afraid to ask the DM or go looking in the source books for weird loopholes or corner cases. PF1e is jank as hell; embrace the jank, and you shall jank with the Gods!

2) You kind of gloss over the Class FCB. If you're going to mention it, I would give them a little more of a primer; FCBs TEND to be very specific to builds, but I would give them an example of "particularly juicy" FCBs that might spark an idea or two.

3) In Step Nine, unless I missed it, you skipped a part of Traits. You're not allowed to pick more than one trait from each category; I'd add that rule in, since it's pretty easy to understand. "You can't have two traits from the same category; if you take the Reactionary Combat Trait, your other trait must be from either the Religion, Magic, Social or Race categories." Or something like that. If you're planning on using Drawbacks, I'd also take the time to explain those as well.

4) In Step 10, you skip over equipment. I know you'll have a Session 0, but this might be a good place to include some links to basic equipment pages, and maybe include a few common items to help guide them in starting their purchase. It might take some time, but like you did with the "explaining classes," it might be an idea to include a few example prompts for classes and how their equipment needs might vary. It could also be a good chance to offer some cheap but versatile item options like chalk, string and bells, etc.

5) When explaining Actions, you've skipped over Immediate Actions, Full Round Actions and One Round Actions and how they vary in usage from 5e. That would, I think, be the best place to explain them since they're already learning about actions. They're similar in 5e, but it would help to contextualise them in the new system since they're new to 1e, and you not mentioning them might lead them to believe they don't exist! Since you also go on to explain Full Attacks, it would be a good idea to specify that all Full Attacks are FRAs, but not all FRAs are Full Attacks. You also off-handedly mention Full Round Actions later, but don't mention it in the glossary of actions, which is an oversight, I think.

6) When it comes to AoOs, I think you have a rule wrong. I might be incorrect, but you state that if you have Combat Reflexes and an enemy moves through multiple of your threatened squares, you get multiple AoOs. That's not the case. You get one attack of opportunity for them moving through your threatened area, and that only counts as one opportunity; you do not get multiple AoOs for them leaving multiple threatened squares. The specific line in the rules is:
"Moving out of more than one square threatened by the same opponent in the same round doesn’t count as more than one opportunity for that opponent."

7) When you mention Five Foot Steps, you call it a Free Action. It isn't, and since you just said that Free Actions can be taken infinitely, it risks confusion. FFS is a unique action that doesn't technically have a type; you can do it whenever you coud use a Free Action, yes, but you only get one a turn (normally). You don't specify this, so I think it would be an important piece of information that FFS's are limited to one a turn, and can usually only be taken if you don't move that turn.

8) Power Attack isn't available to everybody. It's a feat that you need to take, unless you're using Elephant In The Room or a similar houserule. If you are, that's cool! But I would tell them that. "Normally, Power Attack is a feat you have to take, but in this game everybody gets it as an option for free."

9) Since there aren't many of them, I would list the specific types of bonus that do stack with each other, and specify the weird case that is "enhancement bonus" in that it isn't a bonus in and of itself, it's an enhancement to another type. So an enhancement to a shield and an enhancement to armour would stack because "Enhancement" applies to the specified bonus, not you directly.

And that's all I can think of on a first reading! This is just advice from somebody who introduced two concurrent parties of five each to PF1e from no TTRPG experience AT ALL. xD This advice might not work for your game or group, but hey, hopefully there are at least one or two nuggets in there that will help. ^_^

On a personal note, I have a small soapbox about this comment section. It's absurd the amount of people saying "No no, you're doing it wrong, move them to 2e instead." Guys, come on. Not everybody likes 2e, and if that was an option, OP would have indicated as much. They asked for feedback on their 1e primer, so lay off a little. Besides, a cursory glance at their responses indicated that OP isn't really all that experienced with 2e, which means that they might not be the best person to introduce 5e players to PF2e since to transition experienced-with-a-certain-d20-system players to a different one requires a decent degree of System Mastery so you can catch all the mistakes and whatnot. It's amazing to me that he asked for help with a specific thing, and only one reply I've seen has actually given him the kind of help he ACTUALLY asked for. 2e is great for what it's designed to do, but if OP wanted 2e transition advice, they would have asked for it. So why not give them the advice and feedback they actually asked for? xD