That suggests that the flight would not be ok if e.g. the plane was out of time on its 50hr check, or some other thing which is ok on private CofA ops.
Interesting... I recall one school local to me used PPLs to ferry planes for maintenance but they took care to ensure that the pilot paid for the fuel. Given these were trainers, it seems this precaution was wasted unless they were out of time on something. But I used to fly with one of the pilots and he said he had to pay for the fuel to make it legal. Of course the school would have preferred that anyway
The only realistic issue in this is insurance.