The developer portal says little if anything about Switch, only Wii U and 3DS. You need Nintendo's express permission to receive anything regarding Switch dev tools. You certainly don't get any SDK just for registering on the developer portal.

It depends entirely on who you are how easily Nintendo will give you a devkit. I pitched my own games twice and have been turned down twice. It's not easy, especially if you aren't known. For every small but known developer who says Nintendo is a dream to work with there are five small unknowns who say they get rejected with no feedback and no word on other options. It can be very frustrating. I'm hoping this situation ends soon, especially seeing as the original justification, quality control on the eShop, has obviously gone straight down the crapper.