How the discovery of the shots causing more production of IgG4 as opposed to the other classes of antibodies might explain the negative efficacy of the shots

So yes, it explains the late-onset immune compromise that we’re seeing, if these shots induce IgG4 shifts, as we now know they do.
IgG4 transformation is part of developing what we call immune tolerance: Where the immune system recognizes a foreign protein but doesn’t mount a response to it. It’s a great thing to do against pollen. It’s a terrible thing to do against a virus.