Have you seen this video? It's old but from P99, I would be weary of trusting any spawn information not p99 specific.
https://www.youtube.com/watch?v=dMcSz_Yoxb8
It shows him pathing up right beside the static aviak on the West wall near Groi camp, the same loc that's on his wiki page I believe. I had a tracker toon camped in SK and just spent a few mins trying to pop him for you fbut no luck, a Centaur Faun did stop on that exact loc though (413, 2541).
The wiki also mentions a static centaur between the bridge and paw on the discussion part, I couldn't find it though. Have you found/killed a static centaur?
If I get a chance Ill spend a few min trying again tomorrow.