Yes I've noticed, unfortunately Apple just can't seem to be able to keep and up to date list, yet that page says it was updated three days ago. Our Canon that was released fall '14 is still not listed and it works fine.
Believe it or not, and I'll sure agree with your HP Laser comment, we're still using an old HP Laserjet 4ML that's fully networked that's also on Apple's list, which is quite surprising as it uses and needs an old Apple DIN serial cable and also needs AppleTalk to work, so OS X 5.x is needed as well that an old G5 under my desk is supplying since my old iBook G4's HDD died.
It's more than 1/2 through it's third box of 5,000 pages and on it's second refilled toner cartridge that cost about $54.00 several years ago. How's that for good economy monochrome printing?? Especially considering that the printer was given to me years ago as they couldn't get it to work with their newer Mac at the time. Anyway, sorry to babble on…