If the spurs “serve a function”, then they are not vestigial... just sayin’.
Whether or not the spurs serve a function is not my contention. The Fact that they are refered to as ‘vestigial’ in an ‘evolutionary’ sense is.
The Bible being the Truth that it is, I am very willing to say that snakes had legs. And they were eliminated from snakes because of the serpents role in that original sin.