It is not counted as dollars. It is treated as btc. If the price of btc is high. Then the amount of dollars increases. You can see how much btc you have to pay for buy copper. Follow the screenshots below.
Technically, it is still evaluated in dollars because of the value of BTC. 0.002 BTC could mean $22 today, but $10 tomorrow. So to further understand the value, monetary value is still accepted.
After all, someone's gotta buy BTC in fiat.