I had not heard of this latest piece of bs until reading the Natural News.com article about Referee Whistle Syndrome (RWS) which the mainstream media is advancing as a way of explaining peak athletes collapsing on the field. It seems that noise has something to do with it. But, this is testable, for there may well be cases of athlete collapse not involving bells and whistles. Still this is only substituting one mystery for another, for why would whistle noise, that has been common in sports for at least 100 years, now suddenly cause heart attacks? A more likely explanation is that it is the Covid vaxxes. Bells and whistles are just extras!
https://www.naturalnews.com/2022-03-19-vaccine-industry-says-whistles-cause-heart-problems.html
