There are different reason why a Businessman will accept Bitcoin Maybe he wanted to accumulate bitcoin so He tend to accept Bitcoin as Payments but will just Let the coins in His wallet and the he will replace by fiat on his own pocket in this point He can purchase Bitcoin in lower value because the selling amount of each items is surely has added percent of his profit.
and also most people that accept Bitcoin as payment don't look at the value instead they take it as is.
I don't agree with you regarding this statement. Taking bitcoin as a payment is a great change to me to be digital. In here, our government has a vision to make our country digital within 2021. By the way, here cryptocurrency is not legalized yet. There has a price ups and downs issues because of market fluctuations. But you can count the current rate whenever customer will pay for it then you may recover. For creating more demand, Bitcoin can be accepted easily as a payment method.
His concern is about the volatility and the value in Fiat and not about the Bitcoin it self.
He has a point if the business is not yet stable and only starting,but if this is already a strong one?for sure accepting crypto as payment will never hurt the business in terms of sudden fall.