Hi there,
isn't that what you would call a hyper-deflation? The value of BTC is increasing so all BTC prices are going down. Well might be just the opposite perspective but our fiat currencies are considered to be inflating, so BTC is clearly deflating from this point of view.
What he said, it's price deflation when prices drop.
Due to BTC mining there is always a monetary inflation of BTC untill all the bitcoins have been mined. If the coin value was stable this would also lead to price inflation, but the value of the BTC is rising so much faster then new coins are being mined that the monetary inflation is overshadowed by the price hyperdeflation.
Atleast that's what I get from it, I'm no economist.