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According to NASA, abiotic production of O2 at Earth like levels is plausible. https://exoplanets.nasa.gov/news/215/oxygen-on-exoplanets-is...

Our understanding of astrochemestry is still limited enough, that we cannot say with confidence that a given signature requires a biotic process to produce.

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Link to full text: https://www.nature.com/articles/srep13977

> Our understanding of astrochemestry is still limited enough, that we cannot say with confidence that a given signature requires a biotic process to produce.

It will always be possible to find a new extreme edge case to deny far easier and more common processes that leave around biosignatures, it's the exact same rhetoric used to handwave away the methane in the martian atmosphere.

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