There's no drag hijacking in Webflow yet. You can achieve pretty much the same site but without the drag-and-lock. You can have full browser sections, you can have the nice menu on the right (floating element, absolute positioning), you can have the animation to next section at the click of one menu element (dot) or button (for example a NEXT button on every section).
If you want to capture the drag and make it go to the next section, I guess you have to find an external script and add it to your site.
As cool as your example site is, there's a good amount of people thinking you shouldn't hijack the drag (capture its event to make it do something else than drag). I have to admit this one is quite okay. Lt me know if you find a script, that's interesting and many Webflow users will be interested.