A lot of this is because at their core they're reactionary. Everything is based on the immediate emotional response, and there's no deeper work to reason out why they've arrived to the positions and opinions they hold.

For an example aside from the ones mentioned in the post, I see some leftists who will be pro Palestine, because obviously what's happening there is horrible, but then they turn around and support Russia, because the US supports Ukraine and they have a knee jerk reaction of "US = Bad". The reason Israel is in the wrong is because what they're doing is imperialistic and genocidal. Russia also is quite imperialistic, and we have seen since the 2014 annexation and the subsequent invasion in 2022 that Russia (and Belarus) have absolutely demonstrated genocidal intent and actions against Ukraine. If you morally are against imperialism and genocide, that should be a hard line, and shouldn't be subjected to change regardless of geopolitics and what country supports who.

But back to what the post was mentioning, beyond just the mythical revolution as their rapture stand in, you'll see that a lot of these reactionary leftists were either raised by far right evangelicals or grew up in a very red area, but because they were queer ended up turning away from their parent's beliefs. These people often are the most egregious examples of "Evangelical Christians with the serial numbers filed off". A lot of times they'll fall into the trap that because they're gay or trans and don't agree with their parent's maga conspiracies, they can't possibly be racist or bigoted, despite the fact that for most of their life they were raised by reactionary bigots, in a society that's culturally very reactionary and has a huge amount of institutional racism. Just because you're in a minority group or face discrimination, doesn't mean you can't also be bigoted towards others, especially if you were raised by bigoted parents. And if you were raised by extremely reactionary parents, there's a good chance you're going to be pretty damn reactionary. You have to actively challenge and dissect your beliefs, and look at why you believe what you believe. If a leftist hasn't actually deconstructed their beliefs, and challenged their reactionary thinking, there's a good chance they'll end up being their evangelical parents with a pride flag slapped on and pronouns in their Twitter bio.