When we're talking about the potential for other activities outside of repair, diagnosis and maintenance to be colourable or under the auspices of repair, the more relevant question to ask is whether the default is to allow TPMs to be used in a way that is under the auspices of copyright, but that has nothing to do with copyright.
I think we need to flip the definitional question around and ask to what extent TPM implementations are actually connected to the exercise of copyright.