"The idea is to talk like a small child or intellectually disabled person"
That's effectively an ignorant description of the entire doge meme.
RationalWiki's "source" for this information is a Reddit post with 6 upvotes and 5 comments. It's remarkable that anyone on hackernews even knew about this.
What is this subculture that watches for any slang to be used by an objectionable group so that it can be proclaimed a cultural characteristic of said group?
FWIW I think GP has a point, a lot of this stuff just bleeds into normal Internet slang. Despite what the news would say, I don't expect any rando posting pepe memes in a discord to be a hardcore /pol/ dweeb.
Yeah look, I'm still pretty young, I'm usually "in" on whatever Internet slang is en-vouge and even use it myself in more casual places, but I still cringe when I see "zoomer speak" on this site.