Also, if you were to make a claim about a long-term side effect that would not be evident initially. You would also have to explain the mechanism of action or physiology of what is going on, especially if the entire claim is hypothetical and unfounded.
Otherwise, why would something be an issue down the road, but at this time not be an issue?
Wouldnt it not make sense the other way around? if the substance that is injected actually does harm, why is the harm dormant or delayed and not doing harm right now?
Of course, there is the possibility of anything being true, and I am sure more will be learned with time, but the claim needs to be substantiated or explained, otherwise, it’s unsubstantiated.