This comment is made with the hefty benefit of hindsight in which you can see what they've done since, and can now generalize to "electric cars" so that their whole arc has a cohesive narrative.

Fast forward 3 years with this company and if they build their unified notification inbox product, with the benefit of hindsight you could say "Superpowered started selling productivity software, and its still selling productivity software"

I have no idea if this company will pan out or not. But I do know it's very easy to craft historical narratives that seem so clear after the fact. I have watched many founders do it.

"Microsoft started out selling software and they still sell software. They haven't changed at all!"

"Facebook started with a social network and they're still a social network! They haven't changed at all!"

You're completely missing the point. You can do the same or similar things while starting with a small audience and scaling. Target a small pool to get product/market fit and gradually expand your target audience until you're a billion dollar company.