Interesting. Thanks for posting Vincent.
"Vegan" may be a result, which can be reached through a number of starting points (e.g. animal rights, environmental concerns, health, taste preferences, income, religious underpinnings, etc.). Whereas the term "animalist" your article poses, may make clearer the starting point (i.e. the grounding for the subsequent choices made), but less so the ending point? I think it's arguable that an "animalist" is not necessarily always vegan as an end point; and perhaps too, being animalist would entail other changes: What do you think? ...
Perhaps, what one could say in that proposed interaction (in the article) about the cow's milk is: "I don't drink cow's milk, because I dislike drinking the milk of another species". ("Why's that?" ..."Because it was only intended for its calf." ...) And get out of this label business some. Anyway, I'll ponder this further some other time. Good night