SueWilliams, youth co-ordinator for the Aberfan and Merthyr Vale Youth and Community Project, told Radio Wales she had always thought the 80% employment target unachievable.
Last month, the university announced the couple also donated 18 works from the Broads' personal and foundation collections by artists including Jonathan Borofksy, Terry Winters and SueWilliams.
Sue was found in 1990 in South Dakota by the seasoned fossil hunter Peter Larson and his then companion Susan Hendrickson (for whom Sue was named) on private land belonging to a farmer named Maurice Williams.