I can agree that it is probably more than a bit confusing for new customers and new visitors to the forum.
Many of us have been following the developments of the mods this year and last that began to be discussed in this thread:
https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1541785109A "loaded ZROCK2" would likely be one with all the mods, and most of us here would consider that to be the Type 2 caps and the beeswax bypass cap mod and the voltage regulation tube mod. I have two ZROCK2s: one with just the Type 2 caps, and one with these caps, the beeswax bypass mod, and the voltage regulation tube. Both are great components--one is slightly more transparent and dynamic than the other.
As far as bypass mods go they will match the caps that you choose. If you choose the standard caps you would get the poly bypass mod. If you have either of the Jupiter caps chosen, and I believe if you had the V-Caps chosen, you would select the bypass mod if you wished to have that.
The bypass mods on any component give a pronounced improvement in the signal "speed" and the body of the sound and image. It's hard to explain but easy to identify when you hear it. I now have the bypass mods in all my equipment except in my ZTPRE, one of my Taboo amps (a Mk III) and my ZBOX. As time goes by. . . I may well add them to those! I have become very accustomed and very enamored with the "density" and vividness of the sound of the bypass components.
The voltage regulation tube mod involves a small regulation tube wired in the signal path feeding the power supply (I believe) that helps to "clean" the power within the component. It acts in a way like a power regenerator or power conditioner for that particular component. I use power regenerators in my system so the effect seems a bit subtle to me, and may be less subtle to those not using power regenerators. There does seem to be a subtle bit more transparency, a little bit more inner detail revealed on excellent recordings.
I can certainly understand your frustration seeking to use the coupon and yet make an educated decision. A nice "Fac" sheet about these probably should be added to the product pages now that these are such prevalent options. And I would suggest calling Sarah on Monday and explaining how you spent those final hours of the coupon period deliberating and see if she can help you with a decision about the options and who knows. . . it wouldn't hurt to ask if you could still apply a discount. I know she would at the least decline politely. . . .
Hope that was helpful. I and others can help answer other questions as well I'm sure if you have them.