Not sure if serious.
The original comment was in regards to the number of console entries in the GH franchise. not sequels. entries. So yes, Guitar hero 1 is an entry, as is Guitar Hero: Rocks the 80s- not sure why "HMX did it" means much of anything, since they also did 1 and 2.
You also left out Band Hero, which despite the name is widely considered to be a spinoff of the guitar hero franchise.
So with Guitar Hero, 2, Rocks the 80s, 3, World Tour, Band Hero, 5, Smash Hits, Aerosmith, Metallica, Van Halen, and 6 we're up to 12.
You can hit 14 if you include DJ hero 1 and 2- but both are different enough from the guitar hero franchise that it doesn't really make sense to include them as "spinoffs" even if you CAN use the guitar controller for a few songs.