Yes, if it is rephrased.
Whether or not animal milk is "healthy" is a hugely broad question, potentially getting into lactose intolerance, environmental sustainability, impact of added hormones from factory darling, etc. A cursory reading of the question and its title also makes me uncomfortable. Seasoned Advice won't even touch a question about "healthy", and while we do discuss macro and micro nutrients, we also have tended to avoid personalized advice (e.g. "does tofu have enough protein for me?" would not be a good question, "how much protein is in tofu" would be).
But. Something that I don't mind seeing is questions that seek an evidence based answer to myths. This myth might be "you can't get enough protein without eating meat" (I think we'd all easily agree this is on topic), or, as in this case, "animal milk takes a lot of resources (minerals etc) for a human body to digest." I'm in favor of both vegns and non-vegns getting accurate information about nutrition, giving them useful facts to base their decisions on rather than acting out of fear or confusion. Somebody giving up dairy is great, but I am less enthusiastic about it if they were duped into it (even by a well intentioned friend who was also just misinformed...)
And in this case, the OP did specifically request evidence based answers. We can do a better job of moderating questions to focus on what information is needed, rather than letting misleading or emotional abbreviations (is it healthy?) stand.