The article says they think this planet has little solid surface, thus no possibility of life existing on it.
From the article:"Most of that planet, by volume, the vast majority is this gas envelope," he said. As Benneke described, the planet is most likely some sort of core, potentially a rocky one, surrounded by a massive, hydrogen gas envelope that has some water vapor in it.
While these researchers found evidence for liquid water clouds on K2-18 b, because of its lack of surface, rain wouldn't pool on the planet. As rainfall travels through the thick gas surrounding the planet's core, it would become so warm that the water would evaporate back up into the clouds where it would condense and fall again, Benneke said.
Without a real surface, so to speak, landing on the planet would also be nearly impossible to land on, especially because the gas is so thick and has such an incredibly high pressure that any Earth-created spacecraft sent there would be destroyed.
"There are millions of bars of pressure, it would just be crushed and squeezed," Benneke said.