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2. Even if that image would be legit, it proves less than one Bitcoin. 150 BTC is pretty far from that.
It doesn't prove even that. It proves nothing until we see the DEPOSIT section. What if he deposited 1 BTC before all those withdrwals?
3. I stick to the original statement that anyone winning 150 BTC would be busy spending them and would not spend time trying to sell a method/strategy.
I absolutely agree with you here. How much can someone pay for such a strategy, anyway? I would be very surprised if that amount was higher than 0.001 BTC. So, it is logical to assume that he is lying when saying that he won 150 BTC.