You’re conflating the term PHAT on its own with what the connotation is for the P in PAWG. Saying “she is PHAT” is much different from saying “check out that phat ass white girl”. PHAT in the latter description is playing on the term “fat ass” so therefor the ass must be big in general for t
hat to make sense.
I’m also not a fan of the “my truth” type arguments. Words, turns of phrase, colloquialisms, etc all have established meanings that we can’t just change to suit our own particular interpretations or preconception. That has been the whole point of this exercise.