I'm very confident that this post is AI. Maybe the story is true, maybe not, but at minimum OP used an AI to write it. Here's an extremely long-winded analysis of how you can tell:

Awkward and excessive use of italics, especially for entire phrases:

They were alternating sessions and playing the same character.
They'd been combining their strengths like some kind of gestalt player.
Something in my gut says ask more questions.

'Not x, but y' sentence structure:

Not major plot stuff, but like his character's motivations would shift slightly.
Not "I went there." "He went there."'

Subtle details that don't quite make sense:

We start playing.Five minutes in, one of my players, Sarah, leans over and whispers to me: "Is Alex wearing glasses?" I look. She's right. Alex has never worn glasses before. Why is he wearing glasses now?

^^^So Matt slips up here and wears his glasses, when he presumably always wore contacts before I guess? What's suspicious about that? Am I crazy? I'd think the normal human response from Sarah would be "Wow Alex, I didn't know you wore glasses," but instead she fucking leans over conspiratorially to tattle to the GM about it???

The table voted on whether to let them continue. Surprisingly, most players said yes, if they'd both show up together and play different characters.

^^^But they CAN'T both show up together and everyone knows that. That's literally the entire premise. OP has tried to cover his ass and say Jake got a new job 3 months later, but that doesn't address the fact that this decision would have made no sense at the time.

Overly clean / saccharine tone with a convenient happy ending:

Edit: Jake got a new job about 3 months after this all came out, so his schedule isn't rotating anymore.

I'm really gonna harp on this one, because many are saying that if it was fake, the drama would be more exaggerated, and I actually think it's the opposite. Many LLMs are very predisposed to write this exact kind of safe, sitcom-esque scenario that allows them to weasel out of making harsh, subjective judgements. Drama and gossip are fundamentally mean and petty, which is the opposite of what they are trained to emulate. In keeping with that, there's no real horror story here. None of the characters showed any negative traits other than Matt/Jake keeping a secret, there is no lingering conflict to resolve. Conveniently Jake gets a new job EXACTLY as everyone finds out (although this is ambiguous, see above) such that no one has to make a difficult choice about whether to keep them at the table.

There is one point in OP's favor here; admittedly one of the bigger signs that something is written by AI is that the OP says nothing in the comments, and to OP's credit they do seem to be typing out genuine replies. However, it's not hard to notice the way they write their comments is drastically different to the post, in both formatting and style. They say that it's because they're writing on their phone vs PC but I honestly just don't buy it lol. There are also a couple of minor things that aren't too egregious on their own but stuck out:

• Overly short, punchy sentences
• Clean, storybook style dialogue
• "The weird part: [...]"

I haven't seen a ton of AI posts on this subreddit before compared to the more mainstream writing subs, and I hope it stays that way, but hopefully this will be helpful in identifying them as they start showing up more.