That's not what the study's abstract said. It said heart attack deaths increased during the pandemic. It could be due to covid itself, fear of covid while seeking treatment, worse quality treatment, lifestyle chances, social isolation, others, or some combination.

One of the study's authors did say there's a link, but I have to wonder why it wasn't in the abstract.

First, this content is locked in my region so I don't know exactly what you linked to.

Second, if you are linking to a news article about that one University guy who said young people shouldn't take the vaccine, it is my understanding that his study was flawed. But again, I can't read the article so take this with a grain of salt.