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That's likely what their legal team decided on, not what they actually enforce at the customer support level. I've replaced a Keurig. I called them, told them it was not working when plugged in, they asked I send in the little k-cup holder, and sent me a replacement unit.

Any damage to or malfunction of your brewer resulting from the use of non-Keurig® pods and accessories may not be covered by this warranty

I don't see a problem with this -- if a 3rd party part/accessory damages the product, the manufacturer shouldn't be held liable. This applies whether it's a bad k-cup or a third party turbo charger blows up your car engine.

Though the onus should be on the manufacturer to show that the 3rd party part was to blame.

They don’t have to change anything, it says it may not be covered, which means it may or may not be. In this case it will be covered.

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.