We don't know that they pay $400k in 2023 either, the only article quoting a figure I can find is over 15 years old.
The signed a new 12 year lease in 2022, so I suspect they are more than happy with the current arrangement.
The Broncos have been give the golden key to Suncorp Stadium after extending their contract to play at the spiritual home of rugby league for 12 years.
www.broncos.com.au
What do they get for there lease payment also, I know, for example public transport to and from the game is usually included free with a game day ticket (for example)