It doesn't change the fact of what Mr Popo used to be, but it helps to disguise that without removing the character itself or dramatically redrawing him. It might be futile and look stupid, but it's still better than having him on a child's network in the 2010's with the same undertones, because that would kick up a stink so bad Death himself would have to duck out for air.
It is not the removal of black people because they're black people, in all the cases you linked their skin color was being removed because they're potentially offensive caricatures. To me - and this may be an over-reaction - someone saying "they're removing black people from anime" by showing Mr Popo's new dye-job is rude as crap, because it's not the fact that they're supposedly of African descent, which is nothing to be ashamed of, that's being erased for the hell of it - they're attempting to remove the unfortunate implications of that caricature (which also involve servitude to King Kami as a gardener and caretaker? That's a bit suss).
Isn't Mr Popo a god anyway? He's not even of African descent, which means that changing the color of his skin isn't so much erasing a character's heritage for the fun of it (as you seemed to think by the line "Apparentlyt hey don't allow black people") as it is trying to remove the visual implication that Mr Popo is a caricature of a black slave, even if he isn't African. If there was a mainish character in DBZ who actually had darker skin which was more realistic than Mr Popo's coal-black, and a face which was drawn to the proportions of the rest of the cast, it would not have achieved the same degree of censorship as Mr Popo or that kid you linked with the lips.
...Except maybe Mr Satan - he doesn't look white in this artwork by Akira Toriyama.
But I don't know much about Dragonball after all - I just know your bullcrap about Mr Popo is misguided and wrong.
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