All of what you say there goes for women's players as well, being in closed groups, academies etc, and being under the spotlight, yet there doesn't seem to be any issues within the women's game, so not sure that I agree with your analysis here.
I agree it's not a super convincing argument, but does the same really apply to the women's game too? I don't think women's youth football is even close to being this hyper-competitive quasi-industry that men's youth football is, where the best talents are fairly isolated from anything non-football related if they want to succeed. Apart from some national team level players, women also don't get much public attention either I don't think.
It might be the same sport, but I don't think men and women's football are equivalents that you can draw any meaningful conclusions from regarding absence of openly gay male football players. In terms of support, money, profession and many other things it's an entirely different ball game
(sorry).
Besides, it's also not easy to draw parallels between gay and lesbian acceptance in professional sports, because again it's not really equivalent in terms of how the public views either. I already elaborated on some of that in an earlier reply to you, but IMO I think you have to look at both sports in isolation because there are different factors at play.
To be honest I find the over representation of lesbians in women's football almost more fascinating than the sad absence of openly gay male players. There are some interesting theories as to why that is the case in women's football (and likely has been from the start). Personally I think when you identify as LGBT you're already breaking away from society's expectations in you, i.e. be heterosexual, have kids etc, hence following other societal "rules" loses importance. For instance I believe LGBT couples are statistically more likely to be non-monogamous/polyamorous than straight people, because why not? If your monogamous relationship is already frowned upon, why stick to society's standard if you're not so inclined. The same goes for gender expression to some extent. If society already looks down on you for your sexuality, some may think why not have a bit of fun and disregard gender stereotypes as well and dress flamboyantly for instance.
This disregarding gender stereotypes because you're already marginalised anyway I believe is part of why lesbians have been overrepresented in football from the start, at a time when it was still looked down on for women to compete in a contact sport. Another theory is that off-pitch team mingling proved to be a safe space for some women to express their sexuality, especially in drinking games.
So perhaps you could say lesbian players were always integral to the sport and a well-known secret before the women's game even started becoming more and more popular and professional recently.