Any action by the CBN have a way to influence bitcoin price but the extent of that influence depends on what is being done. If its by speech of CBN reps, it won't have much effect or a temporary one and even in my country, the Central Bank has issued a memo warning everyone against bitcoin but still bitcoin and crypto generally is still popular and continue to generate influence among the  youth.

If they then decide to go with actions and willing to go the extreme among which would include, banning of exchange accounts, compelling banks to stop making international transfer as it relates to cryto, transfer between customers within the same country with any notation of crypto, that would have effect on bitcoin price but because whether we admit or not, the banking industry has been a propelling tool for crypto.