That depends on whether the ratio is computed only over democratic countries or whether it's some attempted projection (if so based on what data and what model?)
IMO, It's more complicated than that, because a lot of these preference/identities are a spectrum, and cultural differences not only affect how comfortable people feel about presenting themselves, but even how they actually feel about themselves.
I seem to recall that 85:15 includes countries in which it's practically accepted and in which it's partially accepted. Of course, these kind of polls don't make sense in countries like Iraq, Iran, Syria, Palestine... Although I insist, I think that ratio is still small and I'm sure
we are going to see something similar to what happened with the percentage of left handed people, since the stigma is getting gradually removed.
Actually, a quick Google search seems to confirm this:
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According to NBC, 30% of GenZ identifies within the LGBTI collective.
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On CNN they point to 28% of GenZ adults.
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On the other hand, in this other article, which takes into account other countries where it is not so well regarded, the ratio is 17%, quite close to the 85:15 we were talking about before. And of course, previous generations feel even less identified.
I think it is also interesting to emphasize that being gay/lesbian/trans/queer/other (or even questioning heterosexuality) doesn't imply feeling identified with the collective. There are many people with this sexuality who think that they just “happened” to be this way and do not have to feel part of a community, either because they see it as too stereotypical, because of internal conflicts, etc. Even so, if we take this group of people into account, I don't think the ratio will change too much.