Always learning new stuff.
IOW, theory didn't hold up.
Don't be scared.
In my mind he has a definite flaw in his reasoning. The early bacteria evolved (or were created) in METHANE atmosphere on Earth. Later after plants arose with photosynthesis, oxygen appeared in the atmosphere. The author wants us to believe that one or two methane utilizing bacteria combined to produce a eukaryotic cell that is oxygen based. I don't think so.