
There are like 6 definitions of species so biology has trouble answering “what is a human”
We don’t need biologists to define what a human is, though. We have known since the time of Plato that a human being is a featherless biped with broad flat nails.
This case specifically can’t be appealed to the ECHR since the scotland act doesn’t allow the devolved government to do so (IIRC), so we’ll probably have a few years of this until another case works its way up the ladder.