It's actually explained in the video. The size of the tires required bigger arches to fit, so they're not just "stuck on".
They are functional, not just some kind of pop over the original arch james bond effect fender flares.
Some people don't like riveted flares, but I think they suit this car very well.
Yes, really... compare the two headlights, they have similarities, but are not the same at all. It's like saying two women look the same because they have blonde hair.