It could've said this on the webpage

Not that it makes your journey any less rediculous, but it does actually say that on the same webpage where you download the text file. In a way that's even more rediculous: it's a download page for a text file whose contents are actually also on that very same page.

 

And the jump in version number is probably to equalize it with Visual Studio.

 

But why on earth you can't download the installer separate from the Windows SDK, I have no idea.