I was in Manchester, England during the Super Bowl this past year and not a single person I interacted with knew the Super Bowl was going on that weekend. In comparison, there was a regular season Premier League game that same day between Liverpool and City and the whole city was pretty much shut down to watch this game and pubs were packed. In fact, it was estimated that 700m-750m globally watched that regular season game compared to only about 220m globally who watched the Super Bowl. I don't think Americans realize that the NFL is primarily just an American product aside from niche fans.