I would think they had to find something small and light enough to use those initially, and Chevy unveiling their new electric car was probably all about pairing them up. I doubt they have the ability yet to put these out for heavier weighted vehicles like trucks and SUB's, though those would be the primary market of people at risk of popping tires off road or in construction sites.
I don't doubt they have the ability to have these types of tires for heavier vehicles (as another poster noted they have them for mowers and heavy equipment already), they just don't have one economical enough to justify it yet. A skid steer or something on a construction site that rarely touches pavement, and never at high speeds, may never need to replace the tires through the life of the equipment itself. Investment in the expensive tires upfront is a no brained. But if I have an 8,500lb truck and would have to replace these tires at the same interval as my current tires, I'll stick with the cheaper option.
I also think lifespan is an issue they will have to overcome, and quickly. If small light vehicles are the only thing these can work for (only speculation), the granola folks who have them won't have any concern for flats, but if you can extend the life to 2x a standard tire or something, they will be more interested to reduce waste on something that never goes away, like an old tire.
My personal biggest concern would be the rigidity of it. It's fine for a construction piece that never moves quickly and 'performance' is no concern. But when I fling that 8,500 lb truck around a turn on the highway at 75mph, and there's been a lot of miles out on those tires, will it hold up to the turn, or will it crumple and maybe roll the truck?