I think the intent of the "life finds a way" quote is not that "a single life finds a way" more so that "life, as a biological system, finds a way"

That was my intention too. The rock doesn't care that there's any stuff living on it. Frogs. Cats. Humans. Algae. Things running entirely on chemosynthesis in the deep ocean. The warm damp rock will still be warm and damp if they all die, in a broader sense nothing changes.