Okay, after looking through some sources, not only Laut.de calls it alternative metal, but so does Hard Rock Haven and Mind Equals Blown. I'm not if Hard Rock Haven would be considered reliable, but here's evidence of Mind Equals Blown being reliable: https://en.wikipedia.org/wiki/Wikipedia_talk:WikiProject_Albums/Archive_45#Mind_Equals_Blown_as_reliable_source
I think I'll make a bold move and re-add the genre with that source.