This is part of a list if I'm not mistaken, and based on my understanding this is all tips he gave to people who are looking to invest in the crypto space as newbies. Despite that however I don't think what he's saying couldn't be true for us pros, as even us fall short sometimes especially when it comes to our price predictions and positions.

2x leverage to me is nothing more than a gamble that's stacked against you. moreso if you're an investor since what you're only ever expected to do as one is hold your coins and reap the profits eventually. Having to go so far and greedy to take a 2x leverage is a massive bullet in the head that could literally kill your momentum as a trader and eat all your investments away. Traders can still pretty much survive this as you have said since most of them know what their risks capacities are but I seriously advise against it as well on the account that it kinda is harder for traders to recuperate their momentum and assets especially if you have 2x leverage on all your positions. But who knows? Honestly it all boils down to how much risk you can take as a trader and less about the 2x leverage itself. Personally I think it's a massive risk that you shouldn't take even if the profits look appealing, my opinion could differ to everyone.