He says it to get views. The only place you might hear ‘aboot’ is in Newfoundland. Aboat is I think an eastern thing as well. I rarely hear in in BC.
Dude is from Vancouver, which means he should have a PNW accent. There are some differences between Vancouver and Seattle accents but on the whole they are considered one of the most subtle and neutral in North America.
If you want the American equivalent word, ask someone to pronounce the word ‘roof’. Canadians will pronounce the ‘oo’ like in boot but a lot of Americans will say ‘ruff’ or ‘rough’.