The guy is not Scottish. That is probably why you can understand him. Personally the thickest, most unintelligible accent I have ever come across was spoken by an Englishman. Even other Englishman who were not from his part of the country had trouble understanding him.
No, he’s not, but I watched some of his other videos with his family and I understood them fine, too. I think I’ve just got a better ear now that I’m not as sheltered as I was at the time. (I was 14 when my mother decided to visit Scotland.)
The only one time I was listening to Scots talking among themselves it did not sound like English at all. [I can just imagine the rage if I made that statement in the comments to your source' post.]
It was in a Caribbean resort which for some reason was very popular among Scottish vacationers. In the pool bar two expats were discussing something in their native language – and then one of them turned to me and switched to a perfectly understandable, fluent English. I complimented it. She laughed and said she was a Highlander (huh?) and both languages are English dialects…oh, brother.
Haven’t been to Glasgow but have been to Edinburgh and around the Highlands a bit and a lot of time on Skye. Accents ranged from relatively thick to quite refined-sounding, to my semi-traveled ear. Brummie (Birmingham) was a bit thickish. Thickest, most inscrutable accent I’ve heard was in Newcastle-upon-Tyne, region of the Geordie accent. There’s a lilting quality to it, but once my ear saddled up for its rather loping gait, I understood them just fine. I’ll never forget thinking how adorable it was that someone talked about going to see a fill-im. Yes, film sort of has two syllables there.
I could understand the man in the video perfectly. That accent is quite fetching, actually.
The tech-fail was funny, in a commiserative sense. I think my accent is fairly middle of the road Southernish and those voice-queued menu options on customer service lines don’t understand me sometimes, and it makes me want to stab someone in the neck with a pencil.