Right, but that comment is not a study, it's just someone saying there's a study..... They might be wrong, mistaken, or whatever... Sorry if it seems churlish, but if you are after studies, that comment is not what you want.
The comment that now has a link in it, did not have a link in it when I posted my comment!
Googling “microplastic cardiovascular” brought up both the study itself and a dozen news articles about it. In general, if you think a comment is low-quality because readers can’t easily find the source, you can help by posting that link yourself.