As a retail trader, I take some encouragement from this report. Firstly, he isn't a failed retail trader. Secondly he's not teaching retail trading.
A good trader may not be a good teacher and a good teacher may not be a good trader. He maybe a better teacher than a trader. For many professions, in professional sports, technical fields, the best practitioners are not the best teachers/coaches.
All true. Many retail traders take the view that only a successful trader can teach trading. But they also complain that a teacher with a strong trading history shouldn't need to teach trading if they really are such a good trader. I think this ambivalent attitude says more about trader egos than it does about teacher abilities.
Anyone interested in this thread should check out this other recent ET thread: https://www.elitetrader.com/et/threads/the-final-days-of-whitney-tilsons-kase-capital.319459/