Browsertrix (and Webrecorder tools in general) also violate the standard by modifying response data. It's supposed to be the raw bytes as they are sent over the network (minus TLS).
Unfortunately the Raspberry Pi version isn't supported anymore because their version of Wget isn't well-tested on ARM. I'm surprised it's still there in the repo.
That doesn't really confirm that, IMHO. The line before claims the opposite, in fact: "The Internet Archive has been around since 1996, and while that does not guarantee anything, it shows continuity of support and strong commitment to digital preservation with as much access as possible."
Yeah, the format really needs an update. For starters, WARC only officially supports HTTP/1.1. Webrecorder has started faking HTTP/1.1 data in WARC files in order to save other versions, but I don't think faking data is great for an archival format, especially if it isn't standardized.
The entire WARC ecosystem is kind of a mess.