I don't think so. I don't think he's been that careless about defaming people prior to Monty. It's really hard to sue people for defamation in the US and he wasn't accusing all and sundry of being kiddy fiddlers. The defamation against Montagraph was so egregious -- particularly because it was coming from the lips of a somebody who presents themselves publicly as a legal expert. Yes, yes, we all know that's a joke today, but at the time Rekieta was the lawpope. King of the YouTube lawyers. If he's insisting that Monty is a paedophile on YouTube, people are much less likely to think 'Oh, this is just one of those Elon Musk deals. He's just insulting him. No big deal.' Rather, they're much more likely to think, 'This guy is a famous YouTube lawyer. He knows what the law on defamation is in Minnesota. He knows that a statement like that is defamatory per se. For him to be saying it, it really has to be true.'
I think he said it because he was ruinously drunk and got careless. Had he not been rat arsed pissed, I very much doubt he'd have said something so stupid. Note he's been scrupulously careful about not making similar allegations since.
And once he'd said it, his vanity and his arrogance wouldn't let him back down. Plus he didn't think Monty would have the funds to sue. It's really hard to find a lawyer who'll take on a defamation case on a contingency fee basis. So I think those things made him cocky.
I find it fairly easy to put myself into Rekeita's shoes. When I was younger, I was a big mouthed moron as well. I'd often run my yap. Mostly because I had no assets to protect. So I don't fault him for saying that shit. I fault him for not apologizing and retracting when Monty made it clear he was going to seek legal advice.