Here's what you get:
Lol!

Well that's reassuring because I share Adobe's reaction to that idea!
Ok I tried my best to follow along at home and think I finally follow their 3 tests now as:
1) LR set to printer profile, driver set to app managed.
2) LR set to printer profile, driver set to printer managed, with source profile as aRGB
3) LR set to aRGB profile, driver set to printer managed, with source profile as aRGB
Caveat I don't print from LR, and my software is ancient v3.6 lol, so it took me foreverrr to find the CM settings (they're not in the menus, they're in the Print module's right-side UI panel). And then since I've never used printer manages colour, I didn't know what the OP meant by "setting the printer to aRGB" until I found it in the driver (at least on my HP Z3100/3200s).
Anyhow if I'm finallyyy on the same page for their tests, then option 1 is still the only one that makes sense to me. And that seems reinforced by LR's own warning note against anything like options 2 and 3 (see screenshot). And ofc now that I've seen the settings in context so I can follow the convo, I get what you were pointing at now.
Which I guess leaves us with our initial reactions for valid options:
1) LR set to printer profile, driver set to app managed.
2) LR set to printer managed, driver set to printer managed, source profile as (choose one).
With number 2 ofc being more limited as already mentioned.