Perhaps Mr Wardley could clear this up? After all, it was his design! :--D
In his book "Creating My Own Nemesis", he writes:
"I came up with the idea that while excavating the site for something else we had supposedly disturbed a hideous monster that had been buried underground for millions of years. Its tentacles were writhing around in a snakelike manner (i.e the rollercoaster's undulating track) and in order to control it, we had pinned it down with a steel structure (i.e. the supporting structure for the rollercoaster track)."
Great book if you haven't read it already, with so much wonderful background insight into the rides John designed.
I remember the extended video from Nemesis' first year - as the monster rose from the ground, it grew tentacles (that looked remarkably like B&M coaster track) that reached out and grabbed the Druid-like characters that were chanting to bring the monster back to life. The tentacles then started to thrash about, whirling the Druid-characters in the air as the film then segued to the train zooming around the track with the same Druidic faces riding the coaster.
On the picture of the ride, talking about the track leading out to the brake run, you can clearly see that the spine of the monster turns into an organic version of the track, and you can also see similar organic track-tentacle sections growing out of the monster's legs.