Why would anyone knock any TT racer? GM's record at the TT is pretty good, and he's not done bad at places like Scarborough either.
I don't get all the anti GM sniping that goes on, it's the nearest road racing has ever got to blooming football

To answer the OP, he's entered in the Tour Divide, so he's stated that he's not going to be at the TT

http://www.tourdivide.org

2,7145 miles from Canada to Mexico, off road, one stage all self supported; quite an event to even finish.

As John McGuiness says, 'don't write him off, I'm sure Guy will be back'