1) It's a non-peer-reviewed conference abstract.
2) It's a single author. That's weird, and rare, considering a single person certainly didn't do all the work this abstract describes themselves
3) The single author is Steven Gundry, a "functional" medicine quack renowned for promoting lectin-avoidance diets as cure-alls.
4) It's absolutely impossible to ascertain the methods here.
5) Because the abstract is terribly written, it's almost impossible to work out what they're actually trying to report
6) I'm not a cardiologist, but from what I can tell and my general impression the PULS test is not a validated biomarker. The website gives no publications. The papers referenced in the FAQ are small and terribly cited. The test is marketed by numerous natural health websites.
Edit: one of the only academic results for the PULS test is this 2019 abstract, also by Grundy, that shows that lectin-free diets dramatically reduce PULS scores! Who would have predicted that! (obviously this work was never published, because it probably never existed)
7) The conclusions: "We conclude that the mRNA vacs dramatically increase inflammation on the endothelium and T cell infiltration of cardiac muscle and may account for the observations of increased thrombosis, cardiomyopathy, and other vascular events following vaccination" are over-reaching nonsense.
8) Given what we know about vaccine responses, I'd be more inclined to just think this abstract is bollocks, rather than even any normal physiological inflammatory response
Taking in extra D3 and K2 vitamins mitigates these risks to some extend (by helping your blood circuitry react less to the vaccine or virus).