I think it's the difference between compostable and "compostable in an industrial facility".

Fluoridated forever chemicals can’t be composted in any scenario.

There must (?) be some microorganisms that can break down C-F bonds, because there are organisms that naturally create C-F bonds.

https://en.wikipedia.org/wiki/Dichapetalum_cymosum

https://www.sciencedirect.com/science/article/abs/pii/B97801...

It’s not because that’s how all paper products are waterproofed.

No, often a PLA lining is used e.g. https://www.vegware.com/uk-en/catalogue/single_wall_cups/