I don't know, man. I wouldn't have been able to terrify my 10th level party with a band of goblins if the PCs hadn't been worn down and tapped for resources (both spells/features and HP).
Generally, I'm wary of anyone constructing absolute arguments based on Twitter-quoting Jeremy Crawford. I think he's a terrific guy and a brilliant designer, but expecting what he says to unequivocally manifest the most accurate version of design intent...
I've found that whatever WotC is saying about encounter design/balance... so far has usually felt off target, at least from my gaming experience.
And I'm wary about quoting
anyone from WotC on Twitter or Sage Advice as if it were absolute truth. For instance, Jeremy Crawford (iirc) has contradicted himself in the past posting different answers for how the Tiny Hut spell works. And for years they affirmed that the DMG/MM monster building guidelines were accurate, while tons of us were saying "eh, something isn't matching up here, your guidelines are borked", and what did we finally hear from the D&D One Creator Summit?
Paraphrasing from
Beth Rimmels' article:
"The CR calculation in the 2014 CR is wrong and doesn't' match their internal tool. This will be fixed in the 2024 DMB. You'll be able to use a paper version of their CR calculation tool and eventually a digital version."
You don't say!