I'm going to disagree on this one.
for the following reasons:
1.-This is good if you are always walking around. Not a good idea if you are in any other position.
2.- it is not a good way to carry while you are sitting down, because it is uncomfortable and not easy to access while you sit.
3.- You got to remember that if you are struggling to keep your firearm you need to first get some distance and remove yourself from the attack perimeter.
It is better to have it concealed on the side of your weak hand...but again, you need to practice, because if it is your weak hand you will need to be proficient with it...or they can take it away during a dynamic incident.
Just saying... my opinion and my experience...nothing against the instructor, I love SigSauer Academy. :)