The Tape Filing Card shows Holland, Dozier and the Session Logs say [[H) for producer.

But the Label Copy does say QQX. Often there are second and third versions of Label Copy, where someone has spotted a typo and fixed it. But not in this case.

I can't think of another case where the label producer code "contradicts" the other evidence so reluctantly I'm going to suggest it's a typo and no-one's picked it up ... till now ...