Holiday is not a GC outfitter (link to official list below). They weren't in 1980 either. I was
at that time so I'm confident about that.
It's possible they offered trips to their client list then had a permitted outfitter actually run the trips. From Okieboater's description, this sounds like a lower section trip from below Lava down. Again, it must have been run by an existing outfitter and Holiday only simply sold the trips.
I was in the biz a long time and never heard anything bad like that about Holiday, although I didn't work in Utah. I'd also like to mention that was 31 years ago, if said mishap was in 1980. I understand and appreciate Okieboaters reluctance to use Holiday again (a lousy experience to be sure!) but that was a long time ago. People and businesses change, hopefully for the better.
Grand Canyon National Park - 3 to 18 Day Commercial River Trips: River Concessioners (U.S. National Park Service)