Well, a lot of it is the pandemic, especially since they make a ton on concessions and parking and the luxury/club seating more than the empty seats we're seeing this year. But also, the Flyers' value to Comcast as a corporation has never been as simple as annual revenue, and you also can't just look at the Flyers revenue vs. the Comcast Spectacor subsidiary overall (and NBC Philly as well, though we know they aren't necessarily committed to that business long-term).
Above all though, does anyone at Comcast even pay attention to the Flyers and Comcast Spectacor? I suspect it's still a little bit sentimental for the Roberts family, and any number-crunchers or strategic thinkers who feel the company should get out of the NHL business know the suggestion wouldn't be well-received. The problem is Dave Scott might be very good at running the company, but not the hockey team.