What it says: In short, having suffered COVID-19 increases significantly the risk of heart attacks and strokes: we're talking doubled, and worse if it was severe.
In case we need to spell it out: A lot of people suffered COVID, so we can expect the number of heart attacks, strokes, etc, to grow a lot during the next years — it might erase (or worse) the gains we've been getting through improved treatments and lifestyle changes. Add that to the overall aging of the population (which we also aren't prepared for in terms of infrastructure and human resources), and the social and economic impacts will be huge.
And by the way: If I had to make a guess, I'd bet that being vaccinated helps with but doesn't negate this impact, and not being vaccinated makes it worse.
I realize the overall mood right now is either despair or nihilistic glee at a global semi-coordinated de-investment in any sort of research or investment for structural long-term issues including climate change-driven disasters, civil and human rights, education, public health, and so on, so yet another darned thing isn't something anybody wants to look at. I relate. But here we are anyway.