Because, under the ANO, that would be illegal.
And, he has already stated that he isn't looking for a loophole
??? why is having a dinner with some friends and then going for a flight afterwards illegal? and what is the loophole?
So I meet my mother, father and girlfriend.... they buy me lunch, maybe we even stay over in a hotel...at some point we go flying... all illegal?
Edited to add : common purpose might include enjoying the view and as I didn't own a 10 seat aircraft we had to make a few flights. Seriously you've never taken your mates for a short flight???