Did you read the study or just the headline. The study has more word salad garbage.

What the study did was compare hospitalizations of fully vaccinated people who had covid like symptoms vs previously infected unvaccinated people who had covid like symptoms and found that 5x of the unvaccinated tested positive for Covid19.

It would be like comparing people who went to hospital vaccinated for the flu but had broken leg symptoms vs people who previously broke their leg and went to hospital for broken leg symptoms and finding that 5x of the previously broken leg people actually had broken legs. Then you come to the conclusion that the flu vaccine reduces the chances of a broken leg. But it doesn't. Maybe it means the flu vaccine causes broken leg symptoms. Who knows. It looks good but means shit.

So basically a bunch of fully vaccinated people are going to hospital for covid like symptoms but don't actually test positive for covid. Hm.... that's interesting.

So they are really comparing 2 different things and coming to a conclusion that may imply some sort of connectivity but in reality means nothing.

The only way to actually find out what they are inferring would be to test all ( or a large sampling ) of vaccinated vs previously infected. Which has been done and previously infected have 17-23x the protection a vaccinated person does.