Board Thread:General Discussion/@comment-101.103.30.52-20140219060142/@comment-1600847-20150915162835

WrathOfHircine wrote: Its a spin-off and its most of it is canon All spin-offs are considered canon on this wiki (i.e Battlespire and Redguard).

As for ESO, since Bethesda markets and published it it's safe to say they consider it canon too.