Yes, I didn’t structure that part very well. My general point was that evidenceisaccumulating in the direction of Mars having had life during the Noachian period. Not a strong signal (as the evidence isn’t there yet), but a weak signal in favour of the stellar nursery model alongside strong evidence for molecular panspermia. You are quite right that a habitable but uninhabited Mars would be weak evidence against panspermia.
Yes, I didn’t structure that part very well. My general point was that evidence is accumulating in the direction of Mars having had life during the Noachian period. Not a strong signal (as the evidence isn’t there yet), but a weak signal in favour of the stellar nursery model alongside strong evidence for molecular panspermia. You are quite right that a habitable but uninhabited Mars would be weak evidence against panspermia.