Naming convention is probably muddled to create further confusion for intelligence gathering. I mean it's pretty simply and obvious what the CJ-1000 is referring to based on a context clues given in a conversation but the whole DF-17, DF-26, DF-100, DF-1000 thing is possibly there to imply (or suggest to intelligence gathering) the roles and performance are different enough to separate the type of hypersonic cruise missile/ glide vehicle.
We should keep in mind that China would now have several in service HCMs that are land based so their designations are going to be DF-xx. These are unknown to us for now but if they already have submarine launchable HCMs like the recently unveiled YJ-19 and probably the YJ-17 as well as a HGV type that is at the very least ship launchable if not also sub launchable. This means they would have had land launched HCMs of possibly several types and ranges. Foreign intelligence would have a working idea of what number of different types China has but the whole confusion with this naming convention could be a part of the muddying strategy.
We know DF-1000 is a HCM powered by something that's not ramjet (suggestions have mentioned scramjet for DF-1000). DF-100 is a near hypersonic ramjet powered cruise missile. Then you have other land based HCMs that are probably referred to in internal documents as DF-xx but you also have ballistic missiles using DF-xx. The proliferation of Chinese long range MaRV, MIRV, HGV (various types) and HCMs is truly confounding and compounding! It causes serious headaches and anxiety for foreign intelligence gathering and war planning. Us on the sidelines aren't the target audience.