Surprisingly, Triumph's website says that not only are the Cruisetecs an approved tire, but that they're OEM, and lists them as the only approved option. I only found out because I wanted to see what tires were "approved" since my wheel and tire plan only covers manufacturer-approved tires.
Not that I've been terribly impressed with Triumph's ability to check its own documentation (the service manual says that the minimum RON is 91, but elsewhere in the same manual says that it's 95. Same issue with torque figures in some cases).