This new Blizzard support article for World of Warcraft has been grossly inaccurate since at least September 17, 2020 which was around the time it was written. European and Classic realms are mixed together with American realms (thus making the Classic list incomplete), connected realms are wrong, and some servers listed were Classic realm tests for developers and therefore do not even exist.
This has caused a lot of confusion, especially for new players: https://www.reddit.com/r/wow/comments/lzd0h0/what_realm_is_linked_to_stormscale_eu/
If there are any other places I should submit this, please let me know. In the meantime, if any players want to give negative feedback at the bottom of the article, it may help to get it looked at and fixed sooner.