Haha, I'm all for hopium but that number is ridiculous.
Anyway this is how they calculated it.
“If they add 5%, which is what Dan Tapiero says, I think it’s way too aggressive. Maybe over time, maybe in the next three to five years, that could be possible. That would take the price of Bitcoin to $773,000 in the next three to five years pretty easily.”
In truth I'm ambivalent about very high BTC price too soon (in USD). I need it at some point and believe in it long term (need it because I don't have many BTC), but if we get there too quickly, it's probably a sign the USD has collapsed rather than BTC has grown that much, so that high value BTC wouldn't be worth that much at that time.