Rohann, I'm concerned you are quoting the Canadian Firearms Safety Course, or the training aids, as an authority on anything related to firearms. The course, and the video, were developed by the same mentality, and indeed the same people, who cooked up the friggin' Act. Credible, it's not. Not to say safety training in firearms isn't a laudable goal, and it is really the only part of the latest gun control I can swallow, but still, there's lots of mis-info in the course, and lots more innuendo intended to put folks off shooting.
Lots of firearms are not tremendously lefty friendly. RH bolt guns, with gas escape ports on the left side of the receiver come to mind. Keep the gun in good condition, use good ammo, sensible hand loads without trying to eek one last load out of a tired case, and wear safety glasses. Good advice for right hander shooting right handed rifles too.