Exactly the opposite, O2 is needed for the biological action, to break down the chlorophyll, sugars, and starches. If you “burp”, you’re exchanging nitrogen that’s built up in the jar from bio action, for O2, that is needed. Plus you’re lowering R/H.When you eliminate O2 the plant uses(uptakes) nitrogen in place of oxygen (the green, the chlorophyll,) in an anaerobic state. This is the beginning of curing. Introducing O2 slows down or stops the biological curing proccess.