Ahh... ok, you sounded a bit like her, just curious.
I have not heard of oxygen denaturing enzymes, but that doesn't mean it ain't so. From what I have read pH, temperature, and solvents can denature proteins (enzymes). In some situations (again I haven't had time to dig for details) proteins/enzymes can renature. It doesn't sound like renaturing is super common, but way above my paygrade and just trying to learn.
Imo SST's are the best. What a pure unadulterated form of enzymes, pgr's, pgh's, etc! It is also my understanding we are getting most of the same benefits from using coconut water or sst's. Pretty interchangeable. Kelp meal is also amazing. It contains over 70 microelements, IAA, Manitol, Alginic Acid, etc, etc. A must have for every garden!
Peace!
P-