That guy in the video has a residential/ commercial property. His kilowatt need equals that of 12 > 15,000 sq. foot residential homes. ( plus he has four EV vehicles in his garage needing charges ).
His mistake is having a minimum purchase of Tesla powerwalls.
And btw, there will be no housing crash. There is a huge shortage of new homes available in the USA marketplace for sale. New homes being built has been disrupted by supply chain issues of all the materials and components needed for building residential homes , including skilled labor shortages.