The KJZZ website confirms it, but doesn't mention anyone else dropping them. It's almost certainly that the retransmission consent contract ran out and KJZZ wants more money and Dish doesn't want to pay it. This happens with a lot of broadcast stations and the TV providers.
KJZZ is still on Comcast channel 3 as of this writing, but I'm not holding my breath while waiting to see if Comcast drops the station from its line-up. After the battle between Comcast and KPNZ (Estrella TV) earlier this year, I wouldn't be surprised if they drop KJZZ as well. That is, unless the KJZZ retransmission consent contract with Comcast is paid up for another year or two.