Nitrogen vs. Oxygen
I think it's all over-hyped. Moisture in "common air" (air compressor) would be one factor. There's only so much oxygen in a "fill" of a tire, so any hype about oxygen oxidizing a tire internally would be quickly used up by the limited O2
This article here suggests that the physical size of N2 and O2 molecules is very similar
.getnitrogen.org/pdf/graham.pdf