That's a very weird implication. All human beings are complex products of social, economical, genetic, environmental and historical factors.
External factors do not make a person "less themselves" or "less real".
There aren't to many openly gay Saudi Arabians.
Anyway, the alarm is very selective. I don't see people rapidly reducing their animal product consumption because of dioxin, a potent endocrine disruptor that is bioaccumulating. Atrazine is still used in most US corn production, are all the people concerned about plastic avoiding non-organic corn and corn products?
Why does that seem obvious to you? Additionally, even if it's true, it may not be the only cause in rise of cases of gender dysphoria. Additionally additionally, it's also possible that some change in our environment has affected the prevalence of "LGBTQ+ acceptance" in the first place.
There's no doubt that there's an aspect of the expectation of acceptance and safety that makes self-identification more viable (certainly more so than the expectation that your family is about to throw a bunch of rocks at you).
However, that does not mean there's been no change in the underlying rates - it just means that the data is noisy.
We've dealt with noisy data before.
It is the reason we're well fed and well educated - here's where I'd look for the cause of acceptance.
It's also the beast we built to burn the world.
Hence the trend of people identifying as 'non-binary' in recent years - it's the logical conclusion of believing that 'man' and 'woman' refer to a collection of gendered stereotypes, rather than a description of one's sex.
I'm sure I'll regret this comment - I really don't have an axe to grind - I just don't find that 'obvious' at all (however real and fine the feeling itself).