The show had already established how Tendi has green blood earlier in the series after an injury and it would have been an easy to infer detail compared to humans in the show.
Other animated shows like Steven Universe already show how non-pink blush colors can work in animation.
not the biggest fan but doesn’t TNG suggest that all (most?) biped races in trek share a common ancestor?
Yes it does, i think there is a tos episode that hints at that as well