IMO this analysis makes the common error of not understanding the Energy side of Tesla and where the world is headed. We KNOW renewables will be taking over a decade from now, Tesla won't have a significant chunk of that $2T+ RE market in 2025? How?
Installing solar panels is essentially like delivering televisions. Manufacturing solar panels is essentially like manufacturing televisions. Neither is all that likely to create any significant margins for Tesla on their own, but that's not what the world will be like in very short order. Somewhere around 2022-25 Tesla will become the one-stop shop for residential energy and transportation needs. Plenty of others will manufacture high quality EVs, or install panels, and/or install battery storage, and/or provide energy aggregation and microgrid services. But it's unlikely others will be able to do all of it any time soon.
Just around the time net metering starts going away en masse in the US as grids overload at peak, Tesla will be manufacturing/installing Powerwalls at 1/2 the cost basis they are right now. By 2023 they'll be able to install solar at $2/W and Powerwalls at $4k a pop with industry best margins. They'll be vertically integrated on ALL fronts so no one will be able to touch them on cost, let alone quality.
Add to this the ability to bundle all your energy needs with the top of the line EV at a reasonable price.....why would you source from anyone else in 2023? You gonna get your solar at $1.92/W from the guy down the street with a random LG battery pack priced on par with powerwall? You gonna buy a BMW EV with admittedly a nicer interior, but limited range, crap self-driving, higher pricetag, and no supercharger network? No, you'll quite obviously get all that stuff from Tesla and monitor/tweak it all from one app.
Put it this way....you'll get high efficiency solar for your house, a Powerwall for your basement, and a Model Y for your young family, all for a loan payment of about $599/month over 10 years. That's 100% solar for your home with battery backup for outages and the best car you could want, all for less than you pay now for electricity and a Camry. Zero post-production carbon footprint and you save money.