Hi Pasto, so sorry to hear about your friend

Photographer friends are extra special. A short while ago I learned a master photographer who helped me as a beginner years ago had passed away. I didn't know them super well, but when I thought about how much my photographic growth was influenced by them still to this day, it just hit different.
I don't have Z9 (or Mac) experience, so hopefully others chime in. But on the chance some things from Z3100/Z3200 world continued into the Z9, here's some info that might help...
If the "HP Utility" is version 1.17, then it sounds like the same legacy software that's been around for years. For the Z3x00 it's the main status/monitor software for the printers, and also where the paper profiling features are accessed (in the HP Colour Centre).
I've never seen the "HP DesignJet Utility" first hand, tho I've seen it mentioned. It's not a player in my Z3x00 world.
If the Z9 ecosystem is similar to Z3x00, then "paper presets" are media settings installed in the printer's firmware for things like paper thickness, ink limits, automatic cutter, etc. Basically media-handling settings. (Often called .oms files.)
ICC profiles are often bundled with those presets but are completely separate. Regardless of which actual paper you use, a preset must first be selected in the printer with settings suitable for that media (it's selected when loading the roll, but can be changed later in some cases). Then separately you can use any ICC profile you want in your colour-managed apps, like one from printer or paper mfr, or make your own (latter is best).
In Z3x00 these options are managed thru HP Utility > Colour Centre > Paper Management.
So my workflow to add a new roll is roughly:
- load roll in printer, selecting a suitable preset (some hp docs help choose)
- in HP Utility > Colour Centre > Paper Management > Add new paper
- follow the prompts to calibrate the paper, followed by profiling the paper.
- the ICC profile is automatically stored on my PC for my apps (and should be stored in the printer too, but sometimes I have to use the Sync feature for that to happen).
Calibrations expire after a certain amount of time and the software will prompt for redoing it.
ICC profiles last forever but of course may be "stale" if you've changed rolls, inks, humidity, whatever, so redoing those at important times is a good idea.
The presets list usually has a lot of HP media by name, and then some generics. Can pick any of them as long as its settings are suitable for the media. Sometimes need to experiment, particularly regarding ink limit. For example I'm using a generic preset ("Fine Art Paper - More Ink") on one HP paper because it's giving better results (higher ink limit so better gamut and Dmax).
Hope that helps somehow, cheers