I'm in Chicago, and this isn't how they talk. Also, he doesn't claim to be a Chicagoan, and none of his videos, including this one, are filmed in Chicago. My guess is Florida or California.
Maybe so. People move all around the country. I hear all kinds of accents in the northeastern rural place I’m currently at. In spite of that his points are 100%.
If you were to listen to me, you would never think that I was an Oklahoman. No drawl and I never say y'all. Moved here from Oregon 5 years ago. Kept the NW accent.