Sure.<quoted text> The point escapes you again.
Leave genome out of it, because that refutes you completely already.
The structures of "all" primitive cells need not be compatible.
The biospheres cooperation between a body of cells were compatible and shared information creating genes and the domains and phyla of all "known" microbes working together sharing DNA and common ancestry evolved together.
Were there bacteria or cells alien to this body of things, that were conglomerated into the biosphere in existence?
Possibly , but these would not chive with life as we know it, but could exist in microbial life forms not yet discovered.
Meaning there maybe life out there we have not recognized as being life , and he gives an example.
"The best place to start such a search is with puzzling (anomalous) phenomena, such as desert varnish, that resist classification as 'biological' or 'nonbiological'."
He is clearly saying that desert varnish could be a life form.
And there maybe others waiting to be discovered, that exist in a niche other than what we consider life in our biosphere.
There are other examples of life we didn't recognize or understand , but this is an attempt to expand our thinking to incorporate things not in our definitions , extremophiles are a classic example of what he is talking about. are there life forms out there we do not recognize as life?
Once upon a time, all life on Earth was anaerobic.
About all that's left are gas gangrene and botulism.