Seo links cannot point to clearnet.
Documentation: Difference between revisions - Whonix
Generally, please don’t add onion links to any websites anywhere on whonix.org. There can be exceptions when sensible. (Such as if we were to link to a website that is exclusively available over onion.) In case of Whonix wiki it’s still just 1 wiki database which is “in synchronization” [1] between clearnet domain and onion domain. By adding an onion link [when editing Whonix wiki over onion] that edit will also apply to the clearnet version of Whonix wiki.
(There are some unfixeable caching issues but a manual or perhaps later automated cache clear could fix that.)