Let's see, as I understand it, to be "based" means to be courageously and authentically oneself, especially when others will criticize and look down on them for it.
By that standard, pretending to be a pedophile for the approval of your peers isn't based, because that is very inauthentic.
Keeping one's pedophilia a secret and never discussing it out of a fear that people will look down on them for it is also not based.
On the other hand, a Muslim refusing to say "no I would never marry a nine year old" can be very based, especially if they would actualy marry a nine year old, and if you are judging them for it.
Does that sound accurate to you?
I'm a pedophile, so statistically I'm more likely to be gay, but I definitely didn't post that one either.