These portfolios, although interesting, are not uncommon and aren't that special.
Pretty much any portfolio with 30-60% in a 3x leveraged S&P 500 that is re-allocated will have massively outperformed the market over the last 3, 5, 10, 25, etc years. But the risk is if a 1980s/90s Japan happens, even on a much smaller scale, your portfolio value will drop to 0.
This portfolio really doesn't seem great to me though. T-Bills is negatively inverse the S&P 500 but I feel like the 1.11% expense ratio of the 3x ETF just wastes your time. You're better of reducing risk with low expense bonds or 1x treasury bills. Your returns would only be marginally lower and you'd have even lower risk.