I doubt it. The FTC takes issue with modifications voiding warranty even if a modification doesn’t cause the defect.

That text clearly is about causality: if a non-Keurig part caises damage, the warranty doesn’t cover it (actually not even that: may not cover it)

For example, a sticker covering a ventilation opening shouldn’t void your warranty w.r.t. a design error in its power supply, but if that sticker causes your device to overheat and break down, things are different.