I think that's a good change, though I think they should be more definitive as to what is/is not allowed.  It's not uncommon to see someone rock up to a 'road bikes only' TT with their full TT kit, their TT wheels, and bolt-on aero bars on their road bikes.  I'm not saying that's necessarily a bad thing, but folks should know what they can use, so they'll know what to bring (or not bring).