The Carbon-Overwrapped Pressure Vessels are quite different from the large-scale carbon fiber tanks they're building now. The new large tanks are designed to be

The Carbon-Overwrapped Pressure Vessels are quite different from the large-scale carbon fiber tanks they're building now. The new large tanks are designed to be able to contain large quantities of propellant at moderate pressures, possibly without a liner, while the COPVs are meant to contain pressurant gas at extremely high pressure, with a metal liner. SpaceX has been using COPVs to hold helium pressurant since the first Falcon 9 back in 2010. This is not a new technology. What is new is the large propellant tanks, which have not been done before at this scale, and have not been used in Falcon 9s at any point. So no, you shouldn't have been bolder with a public post.