This looks legit to me. Fingers crossed! I am very surprised Nintendo is still divesting so much money into the Switch when the next generation is just around the corner. Maybe the next gen will be iterative and fully backwards compatible.
I had to update the atmosphere/package3 and fusee to the latest atmosphere versions. Apparently even though we're trying to boot stock, it still requires atmosphere to bootstrap it. The more you know.
If you can boot into OFW on the old switch and the new one, just perform a system transfer. It'll transfer the saves over. Or you can do individual transfers of saves between consoles.