The OSI spokesman appears to be have not really understood the license. It is really two licenses. The first 3 clauses are the open source license. The 4th clause gives an alternative non-open license that the software is available under for those who do not wish to use an open source license.
"Clause 4 appears to conflict with OSD clause 5 because people with disabilities or cultural obligations preventing them from either singing or dancing (or religious issues portraying chickens) would not have equal freedoms under the license,"
and
"It also violates OSD clause 6 as it would prevent use in the plinth industry"