With the search term sn_blackmeta, my results are mostly relevant to the hacking group currently attacking the Internet Archive and others, but there are a few related to black metal music. The "sn" seems to have affected those results as well since they're mostly about the white supremacist / Nazi sub-subgenre. Overall the pollution is easily explained by the very short Levenshtein distance.
The knowledge panel, however, cues off the Nazi music to link to Wikipedia's "National Socialist black metal" page, with one very curious addition:
The LinkedIn badge points to an article about the hacking group.
The knowledge panel should have been about one thing not two.
