This bit does not ring true:

Such a scenario would be to Toyota's benefit however, as an unrepairable car will still need replacement—potentially with a new car. Repairability is something the automotive industry has directly combated in recent years, with a Toyota-backed industry group sponsoring a scare campaign to (unsuccessfully) undermine a right-to-repair bill. Car companies make their money from selling new cars, not keeping old ones on the road. If cast bodies serve that end better than those stitched together, it'd be no surprise to see them become the industry standard.

Car companies need their cars to hold their value secondhand so that the people who buy their new cars can afford to replace them more often. The right to repair stuff is about forcing people to use their dealerships for repairs.

No idea what Toyota's plan is for body repairs but destroying their second-hand market is probably not a part of it.