Breaking buhari finally retires oyo ita names esan substantive head of service

I think there may be some misinformation here.

As of my knowledge cutoff, President Muhammadu Buhari has not retired. He is still the President of Nigeria and has not announced any plans to retire.

Also, I couldn't find any information about Oyo Ita being named the substantive Head of Service. The current Head of Service of the Federation is Dr. Folasade Yemi-Esan, who was appointed in February 2020.

It's possible that you may have come across a false or outdated report. I would recommend verifying information through reputable sources before sharing or believing it.