I think you are remembering correctly. The gnttype.org site has been a valuable resource for as long as I can remember even before this site I think.The feeble/old mind is failing me...
Wasn't the site started by Ken Mosher when he published the first data logging program?
I think I still have an old LT with his Turbolink program on it. I may also have the disc. DOS??
On another note...Is Steve Wood still around?
Vortex Buicks active?
Gee! I'm old!
Some, but not all, of the web pages are cached at the "Wayback Machine" :
Turbo Regal Web Site
Turbo Regal Web Site - Comprehensive information for owners of all turbocharged Buick vehicles.web.archive.org