If a swing trader with an average holding time of around two weeks who managed around 6 trades a month claimed to have no losing quarters, would that seem outrageous to you?
Experienced intraday scalpers rarely have losing days. When I first compiled stats for my trade ideas, I found that day after day the result was positive. It seemed impossible. So I PM'd the person who'd got me on the right track in the first place, someone who seemed to be a long time experienced day trader, and came right out and told him that my analyses see to indicate no losing days and I asked if that was possible. He replied that he had only one losing day so far that year and it was negligible.
The Trader Ed guy that was discussed here recently seems to have no losing days; he's a scalper.
Now I don't have the P/L of sellindexvol and downpruf because the techniques I use are not hugely scalable. If I was trading like them I'm sure I'd having losing days/weeks.
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RN