What do you think drives the ailerons in manual reversion? Take a good look at a picture and try to say there's no tabs on the aileron.
While the balance tabs in conjunction with the balance panels reduce the force to move the ailerons. The now human driven PCU's are what actually move them during manual reversion.
There's a world of difference between servo tabs and trim tabs. Granted, Boeing tends to have the servo tabs revert to a trim tab function to drive the control surfaces with a loss of hydraulics.
In the case of the 737, there are no trim tabs on any control surface. The balance tabs are servo tabs, but have no connection to the control system.
Negative... Either Balance Tabs with hydraulics or Control (Servo) Tab sans hydraulics.
Not true, the aileron balance tabs are not influenced by powered or unpowered aileron control input. They are connected to the wing trailing edge through tab rods. The powered/unpowered control input is applied directly to the aileron.