I haven't looked at the on-disk format, I just use the browser interface. (It's fairly common for me to save something from my phone that I'll want to review on a computer later.)
I was about to post a link to the same URL but archived using singleFile, which looks like the original at amazon. I didn‘t because I realized that I have absolutely no idea what additional information would be hidden in the file. In the worst case any component sent by Amazon and archived into the file may contain PII, even if I am “logged out“.
I‘m not saying that singleFile is bad in any way, I‘m using it a lot on multiple devices, but I‘m not sure whether sharing archives is a good idea™.
Even when I‘m logged out I expect at least information on my geographical location to seep into the archive via URLs addressing specific CDN endpoints or similar mechanisms.
You set up a chrome profile for archiving that's logged into all the sites you want to save. I recommend using burner accounts dedicated to archiving, so you'd have to add them to any private pages/groups you want to archive.
It is possible to use your main account for archiving but there are security risks (you cant share the snapshots without leaking session headers).
Here's an example of an Amazon "review" I recently archived that has instructions for using a USB tester I have: https://readeck.home.nfriedly.com/@b/tCngVjkSFOrCbwb9DnY2yw
And, for comparison, here's the original: https://www.amazon.com/gp/customer-reviews/R3EF0QW6MAJ0VP
It'd be nice if I could edit out the extra junk near the top, but the important bits are all there.