Observer selection bias is independent of the earth vs non earth body question, it's an issue regardless.

Yes, it also demolishes the naïve Copernican argument that because life is on Earth, it must be common.

The more subtle argument was that because life originated early on Earth, OoL must be a high probability event. But that argument implicitly assumes the probability of OoL is relatively constant with time, so it wouldn't be biased to occur early. OoL on small planetesimals is naturally biased to occur early, due to decay of those short lived radioisotopes. After the planetesimals freeze OoL there doesn't seem possible.

Ok. What is an Ool?

Watch the movie Caveman to find out! Ool anyone?

In this context "Origins of life"

I would suggest replacing 'Ool' by 'origin of life' or even better just 'life' then. Is much easier to understand and it just adds one character to the term

I would think this point would be obvious, but apparently not given the many frustrating discussions I’ve had with smart people on the topic. (Maybe there is a subtlety I’m not appreciating?) It’s a relief to see the good solid sense in all your comments on this thread.