I always thought that one of the most wonderful things about music was being able to pass on one's own pleasure and satisfaction to other people.
Obviously the 'teacher' mentioned above has lit a musical spark in the mind of the 'learner'. Making music together is a wonderful thing and if the two enjoy it, why not?.
A guy or gal who has lessons from "someone who has had one lesson from someone who has played along to a record in his bedroom" is never going to be a Segovia, but I would not call them a fool. Perhaps that is not what they are aiming for.
Why should someone who has lessons, passes exams up to grade whatever but plays only im private, purely for their own enjoyment get more brownie points than those two?
The level is different but so what?