If this is so, why not create a genuine vaccine in the conventional way, and offer it for use?
They don’t know how to ensure that the antibodies created by a conventional vaccine don’t make it easier for a mutation of a coronavirus to infect you.
People tried making a coronavirus vaccine for decades. Once the coronavirus mutated, the vaccinated were weaker against the mutation than the unvaccinated.
I don’t see how the MRNA vaccines would be any different in that regard.