[aesh2Xa1]

That's interesting, and I think I've seen that writing style before, although it might have been in infosec circles. What do you mean by the mimicry and viewpoints?

It does seem to be used to signal prestige more than in-group membership in general. I perceive it as mildly haughty.

Also, I don't think acrolect is the right term here, because the all-lowercase style is both not a creole and is not a closer approximation to standard English than some lower form of all-lowercase.

If you need a linguistics term call it a register.

https://en.wikipedia.org/wiki/Register_(sociolinguistics)