The under wing registration was clearly seen with the naked eye by someone with slightly less than average sight (albeit written down incorrectly,...).
Can you re-read that statement and tell me how convincing that one is?
Height estimations of flying objects by people on the ground are notoriously inacurate.
The height at which an aeroplane registration can be read when it flies overhead will depend on the distance, size and type of letter used, background, light and visual acuity of the observer.
I like everyone to fly considerate without causing a nuisance as the latter would not do the GA case any good.
However for someone to claim that they have seen their place being circled so that they saw the registration 'clearly' a dozen or so times despite their less than brilliant eyesight, but then managed not to write it down correctly, does not seem to cut the mustard.