Mr Idachaba, a Christian from the North-Central Kogi, was appointed in February 2020 to head the NBC.
The statement was signed by Mr Mohammed’s media aide, Segun Adeyemi.
Mr Buhari gave Mr Idachaba the boot despite the latter’s efforts to pander to his regime’s tastes.
It came a day after Peoples Gazette reported that some broadcast stations have stopped distributing their contents to social media amidst fears of a government crackdown.
Last January, under Mr Idachaba, the warned media houses in the country to cautiously report the issue of insecurity, particularly around the herdsmen crisis in Ondo and Oyo.