I’m not aware that MXR/Dunlop own their own production facilities, although even if they do, it’s not really likely that a company would dime their capabilities in order to fulfill backorders, they’ll ramp up production slowly so they can find a sweet-spot between supply and demand. You don’t want more stock than you need, especially on a niche product, because stopping and then starting (again) production is not a simple task.
Si