Sort of makes sense. However, gay behavior has been around for as long as.........forever. The Bible discusses it; so it's at least that old.
If it's a genetically recessive gene, then it can lurk around without disappearing. I'd give the example of sickle cell disease; but it amazingly has a very slight evolutionary purpose. Better example is cystic fibrosis. Before the last few decades, with really aggressive treatment, CF people died well before puberty. But the gene persists. Huntington's disease isn't quite a good example because victims don't usually even know they're afflicted until into their 30-40"s.
I'll stick with CF. Fatal before puberty, no apparent evolutionary advantage, hasn't left the genome. Even type 1 diabetes is a decent example. Before insulin came around juvenile diabetics usually died pretty young. But the gene persists. But Type 1 diabetes is triggered by more than just genetics. There are triggers that are complex and not completely understood.
Genetics like we're discussing isn't as simple as Mendel and his peas. Multiple genes, activation by unknown triggers, etc.
Heck maybe homosexuality is a recessive gene that has to be triggered by one of the hundreds of viruses that kids get in childhood.
But the article suggests that for other primates it may foster some kind of communal closeness; and THAT does impart a survival advantage.
Some birds are gay; I have no idea what it does for them.