Good job !
...
Mmmmh... it doesn't feel right, indeed.
Being overly supportive or - on the opposite side - overly critical could be indeed considered as lying. Especially in the teaching context, even if I think it still applies for everyday life.
Just as someone else pointed out in his/her answer, it is better to praise or criticize using specifics. After all an important part of teaching is transmitting information, whether new or repeated (eventually following a different approach) for the student to understand and memorize. Saying 'good job' doesn't convey any information at all in the end, because it is too generic and too easy to say.
One thing I found very difficult with teaching (because it was mostly in front of a class and not one on one) is about 'how you make the student approach the new knowledge you want him/her to learn. Not only there may be multiple ways to approach or explain a concept, but the approach that will be most effective depends on how the student is thinking or living things. To give an example: some will prefer an experimental approach, practicing before intellectualizing/internalizing, while others will prefer to get the 'theoretical view' before applying it in different variants (if this is not completely clear, maybe because of a poor choice of words, consider that my experience comes from teaching mathematics, which I am trying to translate to the music teaching context). On one on one teaching, recognizing what would be the best approach for each student can be done quite well, with time... and trust. And since you never build trust with lies, the teacher has to have integrity to begin with, which is something to which the student will react too.
So, I agree with you Dave and for making these points clear: good job !
I am still not sure why you decided to make this video while driving something though (it doesn't seem to serve any purpose in relation to the points you make), but at least the moving environment was not distracting this time (as it was with some of your videos while driving a car).
One point of criticism I will add here is that you seem to make it quite black and white about what is 'right' and what is 'wrong' (around 5'40) about ways to do things. I am not sure it is always so cut and dry in every case, in real life of course but especially with music and even more so with wind instruments. I do believe that in this specific case, not lying would be 1) knowing all the ways to do thing X (or at least a reasonable sample of the ways to do it) and 2) presenting all of these to the student and see which one he/she grasps better, at least at first (e.g. the many ways to growl). Of course that point is a detail of all your presentation, but it made me react, so here it is: there, I do disagree with you in the way you presented your idea.
The weirdest of all is that even if I don't teach anymore I still know many teachers (of many different disciplines), and for all I know (from their personalities) I wouldn't say any of them would have that issue (while teaching). Could the importance of that issue be related to the topic : art, where recognition as a good performer is a very personal thing and represent sometimes half of the total retribution (ego is really a funny thing sometimes) ?