The question is: does he tell members when to buy and sell in real time? Or it's all hindsight? Again, he might just throw bunch of ideas - and some of them, including those that you mentioned, stick, and become his flagship ideas.
Like this guy Bob Prechter from ElliottWave who made himself a pretty good name by correctly forecasting the 2008 market crash. What most people don't remember is the fact that Prechter's newsletter had been almost uninterruptedly bearish for the nearly two decades prior to 2008 -- and, as a result, according to the Hulbert Financial Digest, was near the bottom of the rankings for market timing performance over those two decades.
To me, unless a service tells members exactly which stock to buy and sell and when and records those signals, then publishes ALL of them, it's very hard to know the real performance of the service.