Allergy shots include the small amounts of the allergen, given in such doses as to allow the immune system to build a tolerance to the allergen. [0][1] It reminds me of psychology's "exposure therapy". [2] In layman's terms, allergy shots teach the immune system to chill, whereas this "inverse vaccine" (as I understand it) deletes a substance from the immune system's memory.
[0] https://www.mayoclinic.org/tests-procedures/allergy-shots/ab...
[1] https://my.clevelandclinic.org/health/treatments/25194-aller...