If you’ve that many Ah stored in that battery to get a car to go that fast, then yes, it should be repurposed for home power use. You could eliminate brown outs by equalizing the draw across 24 hours and never notice power losses due to bad weather.
With the Volt 10kwh can get you about 35 to 40 miles at up to 100 miles per hour. For a house, that’s a third to a quarter of the juice needed to power a small home. He’s bragging he can go faster and farther so he must have a battery that could output more.
Probably a battery that weighs 12,000 lbs and has a 150 mile cable so the vehicle doesn't have to pull the weight...