Yes, you could argue that, but it would be an extraordinary claim.

I might still get indigestion from that taco I ate in 1999.

But it’s really unlikely, since that Taco cleared my system way back then.

mRNA also clears the body quite quickly.

So to have side-effects after so many years, one would need to explain a mechanism.

Otherwise it’s really just very speculative. Might as well believe 5G causes cancer. After all, it’s new technology.