Yes. In that maybe they will become a real thing in the future and improve something. For now, they keep being sold as the future, but until we are in that future, we're in the present where we do quite well with the technology we already have.
They are already being commercialized
It's all correct, but he left out the main barrier to getting solid state batteries to work. When the cathode absorbs lithium ions, it expands a little. This is fine if the electrolyte is liquid, but for a solid electrolyte it creates a problem. So a great deal of effort has gone in to developing a cathode that expands less.