Of course I haven't poured over the scientific literature on such matters myself so I will take your word for most of this, I won't claim anything said here is false, I could not. However... I will pose just simple questions to express my concerns since I think some conclusions are still a bit reductive, regardless of the facts of the science itself.
Is "gaydar" an evolutionary gift if multiple women still for decades have gotten married to closeted gay/queer men unbeknownst to them? and in some cases still bore children with them.
If gay man also have this alleged gift? Why still so much disparity/conflict in opinions and debates over which men are allegedly also gay/straight? Shouldn't these be easily settled questions?
Re: life experience. I can't push back against anything you have seen personally, but I would counter with my own experience that shows that women absolutely have no particular sense for picking out gay men
"no matter the masculine traits.". I would know, many of the guys I've encountered are closeted men with gfs or wives who don't know what their lovers are doing in secret.
Re: bisexuals. I think that their existence is generally a wrench in the entire scheme of the binary understanding of sexuality. I have met bisexuals who claim to have gaydar or believe or in it at least and that's their prerogative but I don't agree. I think the concept of gaydar can only work with a binary view of sexuality as gay vs straight frankly.