Because he made that video after his wife said she didn't want him going to sex workers anymore. Yet He claimed he needed a break for his mental health. That's so manipulative.
He appears to be a compulsive liar. There's a whole string of things that we know he's lied about, some major, some minor, and many of the lies not even necessary. This is the thing about compulsive liars and manipulators. Oftentimes, the thing they gain isn't anything much from the lie itself, it's the kick that they get from deceiving and manipulating people. The smug satisfaction that they pulled something over others. He lived a lie as a JW, as an elder, and now as an exJW. It runs through him like lettering through Blackpool rock.
I don't know the psychology behind people like this, maybe it's "practice" so they can get away with telling bigger lies when they need to, so it's natural. The "no dear, I'm faithful, I'm not going to Thailand to sleep with hookers" kind.
He still appears to be lying about having a PR firm and legal team because going off the letters people got, the reality doesn't match the hype. So why do it? Maybe he believes his own lies, the narrative he has rattling round in his head?
But I don't think he's fully thought it through and eventually the consequences of lies have a habit of catching up with you. Maybe he imagined he'd be able to clean up and sanitize the internet with his legal-letter stunt, make some money in the process, and then get back to his grift. But all he's really done is make the story even bigger.
But it doesn't end there. He's made a big deal claiming things said about him were lies, and that he can and will take legal action against those behind them. So what do we deduce if that doesn't happen?
His problem is that the accusations made about him are credible, because they align with all the behavior he's since exhibited and facts that we do know, even though the allegations predate the subsequent revelations. What are the chances of that happening? Imagine someone was accused of embezzling money and then years later they are caught stealing or defrauding someone? Does it diminish or amplify the original allegation? Imagine that person said it was all lies, was going to take those reporting it to court (but not the originator of it), sent laughably bad threatening letters and then ... crickets. What would people imagine?