It's an older rule[1]. It does technically apply here, but it's not a great look that they're only enforcing it now.

If Gorhill needed to, some of that extra functionality could be moved out into a separate extension. uBlock has done this before with uBlock Origin Extra[2]. Most of the extra features (eg. remote font blocking) aren't a huge deal, in my opinion.

[1] https://blog.chromium.org/2013/12/keeping-chrome-extensions-...

[2] https://chrome.google.com/webstore/detail/ublock-origin-extr...