New Aelven Faction Coming Accidently Leaked by GW- Shadow Aelves?

This is interesting. GW had a slip up in the wording of a WarCom article which has since been fixed. Are the Umbraneth shadow aelves? It looks like it might be. Check these out. 

Here are the two images; before and after the fix. Could it be the Umbraneth are nothing more than a placeholder name? Could be, but I have a feeling this one is real and Shadow Aelves are coming

Interested in the possible Shadow Aelves. Perhaps this might be them?

https://warhammerfantasy.fandom.com/wiki/Shadow_Warriors#:~:text=The%20Shadow%20Warriors%20are%20an,warriors%20even%20among%20other%20Elves.