If this were true then the vaccine would be far deadlier than it is. The claim that symptoms like alzhimers will only shown up years later is completely speculative. So far the ailments from the jab are mostly blood clot related, which is caused by blood vessel walls creating spike protiens that get stuck in the cell wall and heart inflammation possibly caused by adjuvants. There has not been any real data showing prion diseas as far as I have seen.