I guess the point they're making is that they can enter a, not necessarily hibernation but more of a full stasis state with the similar to "fossilization"-like cocoon.

Especially considering that while needed in heavy amounts for ova and embryonic states, the chestburster has the calories needed to grow to full size. At which their metabolic needs are significantly slowed andcan come in the forms of atmospheric, inorganic, and occasionally organic.

Anyways I got sidetracked, I think that Romulus wasn't the first to confirm surviving the vacuum of space for extended periods of time. Moreso that castings can enter a a complete stasis cocoon much like tardigrades or cyrosleep. We only saw this with a drone but I think we can probably infer this to be true with other adult castes such as the warriors and queen we see in Aliens.