I am not sure this idea of "traditional vaccine" is true. The contents of Vaccines can be drastically different. And you cannot generalise that.
> substance is broken down by you body, and all that remains is immunity.
It is quite misleading, to say the least.
Possibly. Or accurate.
In this specific case, you can argue the lipid layer throws a wrench in assumptions, and then the onus is on you to prove some proposed mechanism for long term effect. Because the protein the vaccine targets is not human, the risk of the immune system turning on the body after training was rhetorical, because if the antibodies were targeting our body, it would have come up by now.
Another theoretical concern that has not manifested. https://en.wikipedia.org/wiki/Antibody-dependent_enhancement...
Off the top of my uneducated head, the one theoretical concern would be giving yourself an autoimmune disease, where your immune system attacks something it shouldnt. Like mistraining a model. Barring that, it seems general consensus is that long term consequences are infinitely unlikely.