If he showed me peer reviewed research that says this is happening on a scale not seen before I'd listen to him or anyone else.I would value his opinion as a football player as he moves in those circles, if he says he had never seen a football player collapse in training or a match during his time and now he is seeing a massive increase ,then something must be going on.
Maybe it's because of covid infections, maybe it's adverse reactions to vaccination, at least it should investigated.
Also, does he.not remember Mark Vivian Foe, Fabrice Muambu and others who collapsed on the pitch. A ten second Google found me this.
All pre covid.
Cameroon star's death during 2003 Confederations Cup semifinal remains one of football's most famous tragedies - Anadolu Agency