I cant find anything to confirm that... did your friend cite a source? According to the Ok govt website, this is the current law:
Title 21, Chpt 53 Oklahoma Self Defense Act Section 1290.26
RECIPROCAL AGREEMENT AUTHORITY
The State of Oklahoma hereby recognizes any valid concealed carry weapons permit or license issued by another state. Any person entering this state in possession of a firearm authorized for concealed carry upon the authority and license of another state is authorized to continue to carry a concealed firearm and license in this state; provided the license from the other state remains valid. The firearm must be carried fully concealed from detection and view, and upon coming in contact with any peace officer of this state, the person must disclose the fact that he or she is in possession of a concealed firearm pursuant to a valid concealed carry weapons permit or license issued in another state. Any person who is twenty-one (21) years of age or older having a valid firearm license from another state may apply for a concealed handgun license in this state immediately upon establishing a residence in this state.