Hum. I'd disagree, and even CAMRA gave up preaching the need for oxygen (air) exposure and accepted "breathers" (devices I don't see of any value to home-brewers BTW). But, not wanting to dictate my prejudices in that "treatise" I wrote (linked 2nd post in this thread), I did include the "air" requirement explaining a method of "intermediate" dispensing containers to avoid risking the bulk of the beer to oxygen: It was actually filched from another forumite (
@Dads_Ale, who I haven't seen on this forum for a while), although I think he abandoned the method a while back? I also speculated on a handpump allowing small amounts of beer to be subject (over-night) to "sub-spoiled" which I reckoned has more impact on flavour than contact with oxygen. And finally speculated on using mixed gas to get CO2 "volumes" in the beer below one-ish (saturation level in beer surrounded by only CO2 at 0psi).
But, I reckon if you can control CO2 pressures at very low levels (50-150mbar - i.e. not manually) that does the job.