I don’t know if it is an easy fix to change the artist name to Hüsker Dü on Deezer, but you might already know that you can edit past scrobbles in your Last.fm library as a Pro user, so you could merge the scrobbles to the correct artist profile yourself if you have disabled auto-correction in your Last.fm website settings:
Website Settings | Last.fm
If you have enabled it, you should not see this redirected Husker Du artist profile anyhow:
Husker Du music, videos, stats, and photos | Last.fm
Thank you so much @bluezzbastardzz,
I will also merge the artist pages on our side