Absolutely true. No one (well, very few, even the obvious ones) was even openly gay before the 2000s
People who weren't around as at least a teen before 2000s have no clue how silent anyone was on being gay. It just about never was discussed
It was not a safe thing to admit. Being trans would be significantly worse for them I'm sure
The original question is just groomer-accusing trash, probably by someone who indoctrinates children religiously and are scared another group "with an agenda" might get to them first