No. This is a common way to think about it, but it's wrong imho. Because that money is real and it buys you real stuff. If you have that money one day and it is gone the next, you effectively lost that money. It doesn't matter where it came from.
Think about it: You inherit $500k. You lose it through a scam or a bet or gambling. Do you think it doesn't matter? I mean, you didn't earn that money yourself, right?
There are no paper losses and no "unrealized gains". It's your money and if it's gone, it's gone. Doesn't matter how you earned it.