Question about example at https://schema.org/interactionStatistic

In the course of writing a Perl module to parse JSON-LD, I have been
feeding the examples to it as a test. Tried for an embarrassingly long time
to figure out why this MusicGroup entry was failing the tests before
realizing it's probably not supposed to be a MusicGroup.

It appears on https://schema.org/interactionStatistic among other places -
and AFAICT MusicGroups never get interactionStatistics. Am I missing
something, or is that just a wrong @type?