Some interesting points there, and if you don't do the course some different points.
I've done a few of these courses over the years and I've found that sometimes the course tutor (?) asks the wrong question. Rxample, he shows a NSL sign and asks "what is the speed limit here?" Someone raises a valid point, "what am I driving?". A car, bus, lorry, towing a trailer? There's been several similar wrong questions that have slipped my mind.
Yes, your point reminds me of a question about braking or stopping distances I was asked on my driving test, back in the 70's - The examiner asked what the braking (or stopping, can't remember) distance was for a certain speed and I said it was irrelevant as it depended on the condition of the car, brakes etc, the road condition and the driver's reaction time. He said, "I can't really argue with that". I passed.
We had a really interesting conversation and some other points came up too - another one was "What qualifications does the tutor have, based on the point that 'if you don't complete the course to his satisfaction he can refer you back to the police who can then go ahead with a prosecution if they choose to do so'," - i.e. on what legal basis do they define "completing the course to the tutor's satisfaction? I'm probably more experienced than he is!
Love the sig, I was a bus driver too for a while, long time ago.