In actual real science, a result like that cannot be stated as fact. Since there was no control group you haven't the slightest clue as to the effectiveness of masks or the vaccine. You cannot logically and factually claim it was blunted. You have no way of knowing if things would have been better or worse without masks and vaccines.
During the pandemic, I took care of patients who had the vaccine and were sick as shit. I myself never got the vaccine and tested positive for COVID but wasn't even the slightest bit ill.
Every hospital required them because no hospital wanted to be the hospital that the media and general population pointed at and said: "See, that hospital doesn't care about it's patients." It was all about image.
Who said anything was dangerous? Not me.
I stated facts. The fact is that unless you're wearing an N95 for level three mask, you're not doing anything at all. Any "Medical research facility" that tells you different, isn't worth paying attention to.