It’s confirmed on the official EU maintenance schedule, yeah…
https://eu.battle.net/support/en/article/breaking/21898767
Diablo III - 28/01/2021, 18:00 - 29/01/2021, 08:00 - Game unavailable during this time.
So, we’ll need to find something else to do on Thursday night.
You could always roll heroes on the US region if you’re that desperate.