first, Politifact is known to slant the story.
Second, nothing states it "has been fact checked as incorrect and using flawed data".
Your link says:
But it also says
- Several doctors and researchers have pointed out flaws in the report’s methodology.
- In a separate report, public health officials, using VAERS data that had been vetted and confirmed, have determined that there may be a link between myocarditis and vaccination, particularly among boys.
As noted -- her study was fact checked as incorrect and using flawed data. The fact check provides in-depth information on the many faults in the study including the conflict of interest -- and cites references to back up the fact check including the statement about VAERs which merely serves to demonstrate her claims about teenage boys being six times more at risk from vaccines than Covid are completely incorrect.
While there may be a relationship between myocarditis and vaccination -- the relationship between Covid infection and myocarditis is much greater. Claiming that teenage boys are six times more at risk from vaccines than Covid is simply wrong
It's interesting to note that Høeg' lost her residency with the University of California-Davis due to pushing Covid misinformation like this. The university wants to make it clear it has nothing to do with this type of misinformation despite Høeg regularly trying to push this as a study supported by the University of California.