Just for added advice: Toyota also makes battery powered cars alongside their hydrogen cars. Tesla however does not make hydrogen powered cars at all. So without getting into details, it's clear that Toyota knows more about how each technology stack up against each other. So for Tesla to be right on this, it means that without having any knowledge of hydrogen cars they still know that it can't work, even over a company that knows something about both.
It can be described as Toyota having both eyes open whereas Tesla is blind in one eye, but still claiming that the latter sees better.
