Treating BTC as if it is constant, and then measuring loss in USD in ratio to BTC, and treating this as primarily a weakening of USD over the period from 2010 until now.

Is either disingenuous or idiotic. If BTC were a fair and constant measure of value over this period, the price in BTC for cars and houses would remain stable.

but they have not at all.

So are you intentionally being a trickster here, or are you really just without a clue?