He makes a very good point at 1:54 in the video. He essentially says to avoid cashing crazy gains and "to the moon" type nonsense (most altcoins). He acknowledges that bitcoin can give good returns, but only because it has a very "stable foundation" - i.e. a working product and a real world use.
The money he invested in to bitcoin which eventually let him buy the Prius was borrowed. He invested at $10, and when it hit $22, he paid back the loan and bought the Prius, so he pretty much got a free car out of it. Although it paid off for him, borrowing money to invest in bitcoin (or anything for that matter) is generally a terrible idea.
Although in the video you will see the Prius side by side with his Lambo so I think this guy really did make a lot of money in bitcoin in 2017 as well.
He definitely has plenty of money. He has even spent a bunch of money on customizing the Prius, and he talks about how he pretty much exclusively uses bitcoin in his day-to-day life.