I mean, I'm sure you've heard the adage "fake it 'til you make it." John is pretty much proof of that. Literally everything in his life is a gigantic lie, yet he skates by through a combination of gullibility and laziness on everyone else's part. People tend to believe that other people are telling them the truth, especially if it reinforces their own worldview. John constantly portraying himself as a harassed woman in tech, and now as a "reasonable" voice for trannies, fit the narrative that the press wanted to tell, so nobody actually bothered looking into the truth of the matter. Couple that with the general laziness of journoscum who just wanted to rush out an article and not bother with fact checking, and you get over a decade of lies that have generally managed to remain unchallenged.
It doesn't help that the people who are looking into John's history more deeply are generally the ones that journoscum at large don't want to associate with, like us. Anything that's posted here, even if it's objectively true, is automatically dismissed because of its source. Hell, one of the only journalists that actually bothered to put out an article exposing his lies is Milo, who is a lolcow in his own right.
And finally, there's just so much bullshit to untangle and John is such a minor figure (despite his belief otherwise) that it's simply not seen as worth it to expose him for who he really is. We have an assortment of autists doing it for fun for a decade, and even for us it's a pain in the ass to find the truth buried beneath lie after lie after lie, especially since a lot of the evidence has been lost to time, an advantage for John of growing up and trooning out before social media really kicked off. If you were actually trying to write an article summing it all up, it'd be a load of effort for not really much reward. After all, nobody but us actually gives much of a fuck about him, and pretty much everyone who interacts with him doesn't want to hear from him again, which exposing his lies unfortunately won't do. He'll keep his grift going no matter what happens because he craves the attention.