These types of university bios are often
written by the subjects themselves. Even if
not, why didn't he have it corrected?
This wasn’t from a university. It is from a flyer put out by his publisher. IIRC, it was in print for more than ten years.
And it’s customary for the author to write his own bio. Of course, some flunky came forward claiming she wrote it and was to “blame” for the “errors.”