It looks like they looked at it in terms of infection (so not whether it affects death rates) and 90 days post vaccination a vaccinated person was significantly more likely to catch covid than an unvaccinated person who hasn't previously had a positive covid test. This is quite bad..... Edited to add that their number of cases for omicron moderna isn't high enough to draw conclusions from, but the Pfizer one definitely has enough cases to prove there's a problem.