That's right. The sensorless esc's don't care which way your motor's spinning.
In the other thread they were talking about flipping the tranny when using the HV system, because it's sensored and you can't just swap the wires on those to reverse direction.
And I have asked, and no one seems to have had problems with turning the tranny around. The gears in the tranny do not seem to mind which way they are going.