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.
@funkless_eck @medusa TNG Season 6 Episode 20 “The Chase” suggests that a number of species had a common ancestor and that their dna had fragments of code that when brought together activated a holo program explaining this. Several TOS episodes suggest that ancient aliens “seeded” life on many planets.
We did an episode with Trek science consultant Mohamed Noor and talked about this!