I learn something new everyday. LDS church leaders voted in 1969 to rescind the exaltation exclusion (a.k.a. the priesthood ban). Harold B. Lee came back into town and convinced everyone that it required a real revelation to change.
The real story is that almost all of the top leaders didn’t see the exaltation exclusion as divinely inspired (at least not until Lee showed up). They thought a vote was enough to change the practice. They must have thought it a simple policy.