Well, they say "Ignorance is bliss" ! I'd expect ANY person professing to be a tutor, to have a PROFESSIONAL level of understanding of their subject.
Unfortunately, it seems too easy ,nowadays , for some halfwit to jump through a few hoops and become "qualified"
I'm buggered if I'd trust my life to someone who didn't understand the fundamentals of operating an internal-combustion engine on which our continued good health depended.