A glaring omission in the data is reinfection of patients with both vaccination and prior infection.  This data would be vital in accounting for individuals with immune deficiencies, leading to susceptibility to reinfection, regardless of vaccine efficacy.

Also, any-cause ER visits tells me this is little more than a quick meta-study.  Narrowing the criteria to known symptoms and side effects of both infection and vaccination would yield more reliable results.  Instead, we are stuck wondering whether the ER visits was because of myocarditis, or falling off the roof.

Finally, I don't see any indication that statistical analysis accounted for the very large difference in gross numbers of infection vs. vaccination.  We are looking at a 4:1 ratio, and assuming that match-pair analysis is appropriate.