Does the philosophy hold — far back, on durable signals?

The media signals (YouTubers, newsletters) only exist since ~2020. But the philosophy — independent, proven signals converging → hold winners, cut losers — can be tested on signals with long histories. Same engine: walk-forward, 0.3% costs, next-day fills, dual placebo, per-trade significance. Versus SPY and QQQ and Russell 1000.