I feel the same way, but I wouldn't be bold enough to call it dumb. I mean, I assume they know what they are doing. This is very inconvenient for me, as a buyer, but I suppose most companies just aren't Apple, so they throw at us a lot of various stuff hoping that something sticks. And, for that matter, Apple's product line gets more diversified each year too. now it's Air, and Pro, and Max, so I wouldn't bet it won't be G1 Ultra F12b in 10 more years too.
Great, now I can compare it with other Zsomethings. But as the post shows, thats just one branch of many naming schemes HP employs. Also: This already is a workstation, how could it _not_ be "ultra"? Why the doubling? Or does "workstation" just mean "something I can work with", including office stuff? In that case, I am very interested what other letters they use and what they're for.
For the same reason there is the Z2, Z4, Z8. There are several tiers of workstations, the Zbook Ultra is the best PC laptop you can get in a non-boat-anchor format, bar none.