I feel like this could be proven/disproven mathematically using an average oxygen diffusion rate over time calculation for whatever species the author is refere

I feel like this could be proven/disproven mathematically using an average oxygen diffusion rate over time calculation for whatever species the author is referencing. ex: Microbe A diffuses (0.0003mg of oxygen per day)x(population of species)x(years) = 100 billion tons of oxygen diffused into atmosphere per millenia