I have been taking athletes to the state meet since the late 90s. I have not seen any change in the course during that time that would have made it faster. Kids are just running faster now. If you look at track times, those are getting faster as well. Nobody is trying to say that the tracks are getting shorter.
I ran it when it was the Kinney West course back in the 80s. My memory of the course then is not good enough for me to say that it is exactly the same as it was in the 80s, but it is pretty darn close.