Due to the monopoly sentimentality rulerships in the Nigerians governments, I would say yes, the Nigerian government is responsible for the high rate of living and also the devaluing of naira over dollar.
Imagine a country that embezzle and feeds fats with the public funds and yet stays relaxed without burdened to creating national infrastructures neither international infrastructural economic with the potential goals to upgrade the national economic value rate with the welfares of its citizens.

What is to be expected in a government that runs a monopoly economy government like Nigeria?
How would a country like Nigeria wouldn't get tasked and take adequate responsibilities to indulge on valuable assets by exportations nor creating the relationships with the potentials of economy growth and yet they are not concerned about it.
It is basically obvious that they only thinks about themselves and not considering the masses conveniences and welfares a priority?
Why would Nugeira be economically stabled and reliable when the governments are strickly in concerned about themselves alone?
There is absolutely no magic to this, Nigerian government is responsible for the downgrading of the economy and the lower cost  of nairas foreign exchange


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