StartsDisabled=yes is used by one building and one building alone (AFAIK). What "turns it on" is the Strategy Center when you hit Search and Destroy. Observe.
Code:
InitiallyDisabled = Yes ; only will be active when search & destroy plan active
Henceforth if you wanted to use it you need to "clear" the Strat Center function (otherwise you would be turning on S&D for the whoever possessed the S&D Function) to be useable.
~Wize/Skywaters