The issue arises from the spike protein itself. That’s why we don’t see myocarditis from non-MRNA vaccines like Astra Zeneca.

AZ also uses spike, so he's undermining his own argument.

Of course the spike is pathogenic. In this case, though, it could be something else like the mRNA strands themselves or the structure of the lipid envelope causing inflammation. There isn't enough evidence either way for this journalist to confidently assert a single cause.