oh bro, its proven, i trade price action, hedges, martingales, 1324 management since over 14 years, on futures and forex, but as i said earlier, its not "old school", but back to the thread question:
Appealing to accomplishment does not prove that "async open hedged martingale".
YES, its safe, as long you use martingale with several security features, you will survive bad times like CHF hell. If not, you blow your account as usual with standard (casino) martingale. My personal mention!
Perhaps, you did not show some security features? Because the ones you've shown make it less safe than the normal martingale, which itself is horrible in terms of safety.
also "reversion to the mean" (stocks) is not possible in forex, pairs like gbpjpy have a max pips range of 13.500 pips in the last 10 years, you need big balls and unlimited equity to get (back) the "mean"...long term isnt my trading style, only short+medium.
I am glad that you can so easily disprove market theories, but it does not help in demonstrating how your proposed changes to martingale make it safer.