Apple will almost assuredly have a dedicated event later this year where they will announce new hardware.

Apple has development kits running in modified Apple TV's. This is a chip that has essentially been out for a few years in iPad Pros. Why would Apple announce numbers based on this? It also assumes Apple will ship future laptops without fans or ports, which is how the development kit is coming out.

Apple will most likely have an A14X out later this year in at least one laptop. That's going to be significantly newer and more advanced than the A12Z in development kits.