High-quality velvet antler is not ingested and totally bypasses the digestive system as it's either taken sublingually or transdermally. Even still, the cheap stuff in capsule form on Amazon has some pretty remarkable reviews.
The high-quality product does not use any bone; only the tips are harvested.
Why would you question cross-species benefit yet not question that bone broth and bone marrow and offal are beneficial to humans? You eat that. There are many, many animal products that we extract from and benefit from. Does taking Premarin, which is extracted from pregnant mares, make you pregnant? That's the exact line of logic you used above, and you're just being silly. I don't think you're truly interested in learning about this; I think you're just being argumentative. So why should I give this more of my time or energy?
For anyone who is actually genuinely interested, there is TON of info about deer velvet antler online.
"Let food be thy medicine and medicine be thy food." -- Hippocrates