I’m no Keith Evans (who really is an expert on MMT), but that is easily the clearest, most precise summary of MMT I have sever seen. To my mind, the biggest weakness of MMT is that it still has government attempting to 'manage' the economy, as pointed out in this article in talking about raising taxes to quell inflation. (If that could have been done politically in 1969 we'd still be living in a Keynesian world.)
Still, it seems obvious to me that we are going to have to transition to some other paradigm — either in an orderly fashion before this creaking system crashes completely or in a panic, afterward. I vote for a "democratically distributed income" (here in Medium).