Yes they are. I dispute your comment in regards to the 2021 Grand final. At 4.1 million it’s one of the top couple of Grand Finals of all time in terms of ratings. And between two low drawing Victorian teams too which is the worst match up for TV ratingsYou posted that TV rated better at night for ALL PROGRAMS and that's why it's prime time.
The COVID night grand finals aren't in the top 15 most watched AFL grand finals.
But anyway, it’s not about what they rate compared to other Grand Finals. It’s about how much more they rated at night compared to what they would have rated in the day.
Everything rates better at night than what it would during the day. Everything. That’s why it’s called prime time.