Honestly, I doubt they were ever actually "actors". I think it was more along the lines of "well, who do we have here that can do voices?"
Honestly it kind of screams the sort of "quality" va we got in Symphony of the Night, but far, far, FAR worse. But not "Last Alert" level bad, thank god. But not much better either. It's nowhere close to good, but shockingly far from ironic horribleness. The CD-i games just seem like they were voiced by hobos who were pulled off the street and handed $60 for their time.
Kind of like the SOTN Succubus and Richter, who I've always felt were similarly all around terribad. Then again, they're still light years beyond this schlock.