I am already offended, so go ahead.
Seriously, the term and its acronym itself is deeply racist imho, just as stuff like african american, but that is beside the point.
Fact is, in gaming the tag ist just not used in that way. It means proof of concept. And there are exactly 9 games tagged poc on itch right now. And only about 3 use it with the race meaning.
One does not tag races, because that would be racist (duh!). And for many games it would be pointless as well, as you can configure your character. Or you are in such a perspective that you do not even see the protagonist.
I could understand in theory the similarity to tags like female-protagonist. But is female itself tagged? What would poc even mean, if it were used?
As for your question, is there a made-by-a-female-dev tag or similar, for comparision? And if there are any doubts if this whole concept would be racist, ask yourself how people would react if someone would ask about a white person tag or a tag that means the creator is white. There would be a shitstorm if that were an official tagging.
Steam has a better tagging system and they have no poc or similar tags. I checked.