These conventions are for MediaWiki developers. The SVG page seems to be overtaken for use by the Wikimedia Commons by @JoKalliauer. See for example https://www.mediawiki.org/w/index.php?title=Manual%3ACoding_conventions%2FSVG&diff=next&oldid=5707130&diffmode=source.
Also the recommendation to use SVGO with recommended settings is now not so clear as multitude of tools are listed on the page, SVGO being last of them.