Kalandros is right, my guild is still farming Canceril on a daily basis for Windrunners… Templeshooter/Canceril/Archon gimmick has not changed with the World Boss revamp patch, you still need to have a populated channel for atleast 2-3 hours to make them spawn.
If you left your character there, and the channel didn’t crash, then Boss spawned no doubt, if you didn’t find it in the map, someone simply killed it before you.
I don’t know what “guide” you’re refering to, but with the Boss Revamp patch only the Field and World Boss were changed, check this patch note: https://treeofsavior.com/page/news/view.php?n=1057
EDIT: Anyway, to answer your initial question, the new cubes drop the old loots too, it’s just a little harder to get what you want because Field Boss cubes can’t be rerolled now (and there are more items in the loot table too).