Concurred - you could lose your shirt with leveraged ETFs (long or short). A portfolio with high exposure to equity, e.g., 100%, to fund expenses during non-accumulation stage of retirement is highly risky. However, it may not a bad strategy if you want to maximize its size (for your heirs or whatever reasons) and you have a very low SWR (i.e., 1% or less) because of other income, e.g., pension, rental properties.
As other posters have mentioned, why play the "game" when you have already won? If you already have enough to support your retirement, why would you want more and run the risk of losing it all?