They had, for most of the 1970s and the early 1980s, been distributed via microwave to Arizona, New Mexico, Nevada, and western Texas, along with the other three independents in L.A. (KTLA/5, KTTV/11, and KCOP/13). But that was already in the past by 1989 and I don't believe they had aspirations to be on satellite as the core of their new schedule was -- and still is -- a three-hour block of live, local news in prime time (called "Prime 9 News" when it launched).
I read somewhere that the Disney executives knew they could keep the KHJ-TV call letters, because KHJ/930 had abandoned them after the "Car Radio" debacle in favor of the KRTH calls as "Smokin' Oldies". But they did some research and discovered that by then, the audience was indifferent at best and thought channel 9 was inferior at worst.
So they made a clean break with a new identity. It was a radical move at the time, since stations didn't take on an imaging name like "California 9". Although, as I said, it didn't last, it did last long enough to erase "KHJ-TV" from most viewers' minds.