> Scientists found a way to extract up to 90% of oxygen from air! They call it “breathing”

No, they don't and no, they wouldn't. "Inhaled air [at sea level] contains 21% O2 while exhaled breath contains approximately 16% O2 and 5% CO2" [1]. 24% recovery.

[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC8672270/