Those group definitions don't seem all that well defined to me either. I would self identify as an infrequent movie goer (which I'm assuming contains the majority of movie goers).

The delta variant was confirmed in North America in April. So if you're an infrequent movie goer who goes to the theater once a year, and didn't go to the theaters during May of 2021, you don't fit in to any of those categories. That's going to skew the results and make it seem like a lot of people are likely lost, which I suppose could be true but I'm still looking forward to going back to the theaters anyway.