He doesn't use charts or technical analysis. That's in sharp contrasts to the others who talked extensively about support and resistance levels, trend lines, indicators and so on. What Martin very much proves is that there isn't any particular style of trading, which necessarily leads to success. It's a highly individual thing.
As Martin explains in this interview it's not that he has anything against charts and technical analysis, it's just that he never learned to use them and clearly sees no need to now.