Ha! Oddly I can't actually get that page to render, I see it paint for a second and then it goes white and tries to load some tracking js forever. But point taken!
Last time I tried to download the win10 iso while on windows, their site proposed me the download of something along the lines of an installation tool. Shortly after that I tried the same webpage while running Ubuntu and the site proposed me the download of the full win10 iso.
I believe that the webpage checks few alternatives prior to passing you the ISO .