You are boldly and confidently at odds with the usual explanations of the formation of oil:

* https://energyeducation.ca/encyclopedia/Oil_formation

* https://en.wikipedia.org/wiki/Petroleum

these other sources all assert that

   The origin of fossil fuels is the anaerobic decomposition of buried dead organisms, particularly planktons and algae.

I think they are conflating Carboniferous Period / white rot slowing _coal_ formation with Oil formation.