Current Events-Vaccine effects

https://www.npr.org/sections/health-shots/2021/10/26/1046432435/ers-are-now-swamped-with-seriously-ill-patients-but-most-dont-even-have-covid

ERs are now swamped with seriously ill patients — but many don't even have COVID

Could this be happening as a byproduct of vaccines? Or is it just a coincidence?