[masklinn]

Yes: they necessarily do so.

Despite the article's statement, tardigrades are not extremophiles, they can't live in extreme environments. What they can do is exist/survive in hard vacuum and other extreme environment by entering a super-hybernation mode (cryptobiosis).

Furthermore while they can survive fairly long spans in extreme environments they're not actually immortal, the FOTON-M3 mission resulted in 32% mortality after 10 days in hard vacuum but protected from UV (the survival rates were much lower for those exposed to UVs).