That's a bit of a contortion since "Z" is not a regiment. Using some sort of black liberationist symbol in conjunction with a more general symbol from the US attack on the Nazis seems, well, a little odd since it was a segregated military as you say, but nonetheless had black soldiers triumphing over Nazis who would have them enslaved or murdered. I suppose Azov isn't likely being all that nice to trans people, but I've seen zero reporting on that topic.