I wonder how they force a full desktop-web experience for Safari on the iPad. macOS user agent?
To some extent, though, I'm having a hard time understanding how this is useful. Most sites are responsive these days, and it's been a long time since I remember getting a separate mobile site on an iPad. They showed Google Docs as an example, but even if you could use the desktop version of Docs on an ipad, it seems like it would be really uncomfortable to do so (and I though that was the whole reason for not making a touchscreen mac in the first place)?
That being said, on Bootstrap (and Bootstrap-like sites) turning the 2018 base model iPad on its side will give you a col-md layout which is usually enough to trigger the desktop size.
That's what responsive design via media queries is for.