In the last bit of his tweets explaining why he was let go he says

"If it looks like half the population is having a shockingly different reaction to these jabs than was expected – it’s probably because their life experiences have actually been shockingly different" 12/17

— Pete Parada (@PeteParada) August 2, 2021

So its very possible he's exaggerating his reference I doubt he has access to real numbers just like the rest of us don't. IS it possible though that in HIS world there HAVE been so many reactions he's like ummm how can I?? Most of the people I'm around all day are unvaxd, he's probably around the opposite, and is in proportion witnessing much more.