Oh on an interesting note I did hear Arkona in the background of a Russian Neo Nazi beheading vid from a reaction channel. That's how I found them, that was a long time ago too.
Why would Rammstein be on a list about sketchy black metal? The only proof is them being nazi's is them being shirtless and standing in front of a flower for their first album.
This band's profile is 'invisible', meaning that it's much less prominent on the site - either because it's incomplete, or maybe doesn't entirely fit MS format.