Seems to work very poorly, saves a very, very basic copy

[github-account1111]

waybackpack 'https://imgur.com/a/004iJ' -d .\Target\ just downloads .\Target\20230602073430\imgur.com\a\004iJ.html where 004iJ.html is a very basic looking page with a few links that weighs 1/5 the size of any of the images I'm actually interested in downloading. None of the images are downloaded.

[birbwatcher]

This happens because you’re trying to download imgur.com, while the images and other resources are hosted on different domains, such as s.imgur.com and i.imgur.com.
To solve your problem, you can try using this script:
https://github.com/birbwatcher/wayback-machine-downloader

and select "rewrite links" and "download external assets".