I'm currently having physio after a knee injury and likewise stretching is a core element especially after using the muscle rehab machine. I think I'll stick with years of experience rather than a video on the Internet
Well "years of experience" and "a video on the internet" are not mutually exclusive.
I saw a physio recently for (a persistent achilles injury) the first time as my usual physio wasnt available. She started to tell me about how I should stretch and in a roundabout way I asked what these stretches would achieve and she couldn't explain.
Some of the other things she recommended were fine and she highlighted some areas that could have been contributory so it was worthwhile however old habits die hard!
This video didnt tell me much new (other than the ITB being adhered to the Femur!) as I have never been a big fan of stretching even post exercise and there is evidence to show it can even contribute to injuries.