You can see it in the argument the OP is making. There are data points about the percentage of the population that self-reports as LGBTQ+ broken out by year, and the OP says that because a change in the reported data happened in 2020, the Covid shot must have created a sudden surge of LGBTQ+-ness. Those to data points are correlated. But consider also that in 2017, the majority of Gen Z was younger than 18 and less likely to be totally aware of and/or totally candid about their gender and sexuality identity. Consider also that it has become more socially acceptable to identify as gender fluid/ trans/, asexual + and even just bi, and that the change in the numbers may mean that more people answered the later surveys out of that sense that they wouldn't be penalized.
As a counter point, consider the fact that the Covid vaccine became available to people 12 and up in May of 2021: is OP claiming that getting a shot a year later caused a surge back in time? "Things happened around the same time" is how the pernicious and entirely false rumor about the MMR vax causing autism got started: it's why there are so many weird baseball superstitions.
Here's a case in point:
"Mark Teixeira has recently developed a new superstition. It happened when one of CC Sabathia's socks accidentally ended up in his locker.
Teixeira unknowingly put on one sock with the number 25 on it, his number, and another sock with the number 52 on it, Sabathia's number. He didn't notice until the game had already started, and Teixeira had one of the better games of his career.
Following Teixeira's two home-run, six RBI performance, he decided that he was going to wear the two different socks in future games."
Sports writer Robert Knapel, 2018
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