Saw that video some time ago and funnily it's the answer to the reversed question I asked to Alain Caron during a masterclass. 😉
My question was: "Does it bother you to play the fretless out of tune to be in tune with the other instruments?"
It's something I noticed a very very long time ago when practicing my scales perfectly in tune (with a tuner) and that, when I was playing perfectly in tune (for my notes) with others, the overall "chords" were out of tune, wobbling, so I started to really play with my ears listening to the others and adapting for a total non disturbing harmony.
It's at this point that the lines are becoming very dangerous for the music...