That is a pre-indicated stipulation of the green card validity, not revocation based on the whim of an evaluating (non-immigration judicial) official -- ie CBP and DHS and ICE cannot (read: should not be able to) revoke green cards.

The "basic US presence" requirement of green cards has always been present in the validity clause alongside the 5-10year expiry date, and not committing immigration fraud and other basic requirements to maintain green card -- a comical number of European green card holders gloss over/forget this clause every year, that is made explicit to them upon receiving the card and proceed to forfeit their green cards by not entering the US for over a year -- that is not a revocation (implies a subjective decision made by an official), it is a lapse of validity (implies some pre-stated condition was fulfilled).

I see your point. Thank you.

I think most non legally inclined people (like me) would say CBP yanked my GC.

Your point being that - nope, they just enforced the law.

Right?

Yes. People are generally familiar with rights that can lapse if eligibility is not maintained - consider the right to vote in state elections, which you lose if you fail to maintain residency in that state. Nobody yanked your state voter registration or your eligibility for in-state tuition, you abandoned it.