EDT reliably one-boxes, but EDT would do this.
Or do you mean one-boxing in Transparent Newcomb? Then your claim might be true, but even then it depends on how seriously we take the “regardless of what you commit to” clause.
True, sorry, I forgot the whole set of paradoxes that led up to FDT/UDT. I mean something like… “this is equivalent to the problem that FDT/UDT already has to solve anyways.” Allowing you to make exceptions doesn’t make your job harder.