This demonstrates, maybe, some of the limitations in hinging lawfulness on a defined set of activities. Whether an activity is repair, maintenance or diagnosis would require some inquiry that might be difficult to discern in some cases. For example, if restoring features that have been disabled through a rollback or an over-the-air update, whereby your treadmill no longer plays videos like it used to on its screen.... If you restore that, is that an act of repair, or is that maintenance? Is it indistinguishable from repair in some respects? Maybe yes.
I guess my position is that there's more flexibility in a regulatory process that would exempt certain implementations of TPMs from protection altogether, so where a TPM—