Lifeforms around deep sea hydrothermal vent is fully independent from photosynthesis. Even if the sun would have gone off, they would still have been able to su

Lifeforms around deep sea hydrothermal vent is fully independent from photosynthesis. Even if the sun would have gone off, they would still have been able to sustain themselves for hundreds of millions of years. And the supposed ancestor to eucaryotes (e. g. Asgard archaea) have been discovered in probes from a deep vent. So the whole thing doesn't sound too convincing.