The Design and Implementation of the Tor Browser outdated?

Other than “2019” in the subdomain The Design and Implementation of the Tor Browser [DRAFT] is it outdated? Also this comment pointed out Why and how does Tor browser block SVG assets when set to safest? - Tor Stack Exchange

However, I have reason to believe this is false and this document is not up to date.

yes, it’s being worked on

Would be great to have it finished soon, so devs can develop Tor-friendly websites easily.