Indeed, but that's really his point. You can suspend people for doing things, and obviously illegal activity falls under that, as previously noted, but you will never be able to change people's minds if they leave the platform.
I get it, almost nothing will change most MAGA minds - I completely agree. But you won't change any of them of you drive them off platform. And without a 'common square', communication stops completely and the divide only grows.
No need to reply, I 100% understand your point, I just think that keeping lines of communication open are important. If we aren't talking - even to those who would threaten us - we've no chance of changing any of their minds.