Extraordinary claims require extraordinary proof.

As it is, the first time this was posted, biologists and pharmacists discussed the merits of the claims and came to the conclusion that this was unlikely to be real.

Specifically the approach would probably be thwarted the second time you attempted to use this method because your immune system would attack the vaccine.

The discussion also pointed out that this was why the second dose of Astrazeneca during the COVID pandemic was less effective.

Disclaimer: I'm not a medical professional and don't pretend to be one online. I'm reciting from memory. YMMV.