Perhaps referring to it as "a known, T7-specific issue" is going a bit over the top.
I assume what he meant by 'known' was that it has happened before on a triple-seven therefore you can't rule out it happening again.
re. 'tamper proof' communications devices, an onboard battery would solve the problem of needing to remove bus power from the device in an emercency. In fact it could be further refined with an algorithm that sent out a warning if the CB was pulled in the absence of any related EICAS warning.