He owes 200% of the value of his house and is trying to bank on getting work done to it to increase its value. But that price he quoted isn't realistic because the only inherent value a piece of property has is how much someone is willing to pay for it, and people will ALWAYS negotiate below market value. And the idea of the property jumping in valuation by almost $500k its current worth is absolute nonsense, especially when you see how awful the inside of the place looks and that the inside is so much more important than the "curb appeal" when you're selling.
Now, I'm not going to say he's completely Nuclear Armageddon fucked, because the housing market is volatile as fuck now, and it's a buyer's market, but his outlook on the benefits of these "renovations" is optimistic at best, even if he does still have a well paying day job which he DEFINITELY should not quit because his creative output is absolute garbage.