And that hasn't changed, that is still exactly the case. When it's not 4chan lingo (which mostly stays in text/image form), it's AAVE. Not sure why it's always "Gen Z" or teenage girls getting credit for this.
Just look at their list of phrases that are "in":
Phrases that are "in"
>Bet — 'I'm down'. For example, if someone asks you to go out for dinner, you say 'bet' >You devoured/ate — said in response to someone succeeding with style >Full send — not caring, just going for it >Slaps — If something slaps, it's really good (normally in a food context) >Ceebs — a variation of CBF [can't be f*ked] >Ick — a sudden feeling of grossness, often about a person's behaviour or mannerisms
out of these, only "Ceebs" (sounds like the a twist on "can't be arsed") and "Ick" aren't AAVE.
And the list of phrases that are "out":
>No cap — the truth >Lit — something is great, but now considered very "2017-2018" >Fam — used in reference to friends >Slay — used when someone performs well, but considered dated and you'd only use the term ironically
These are all AAVE.