Exactly.
I’ll just add one thought on this, which is that even if homosexuality is proven to be genetic (possibly pending expression, as in epigenetics), that doesn’t mean it’s a good thing. Children are born with harelips and heart problems and deafness and all sorts of things that may be genetic in their origin, but they’re not beneficial to the child. Celebrating being gay just seems so odd to me, like celebrating being born with a cleft palate.
On the other hand, it has also occurred to me that in prehistoric times, having homosexual members of the tribe might be beneficial to the tribe as a whole. Say you have 30 able-bodied men in your tribe, who are capable of going out on the hunt and bringing back meat. But what if only 26 of those men have bonded with a woman and produced children? The advantage would be that you would have more men (all 30) producing for the tribe, yet fewer young mouths to feed. So those children might be better fed, and you might get a higher rate of children who grow to maturity.