It was set in Newtown - which was literally a new town, like Skelmersdale and Speke, built to replace the slums and bomb damaged houses of Liverpool, and re-house their inhabitants. Pure scouse, much more culturally linked to Liverpool than nearby St. Helens.
Anfield has recently hosted some major Rugby League events but they weren't very well attended...
https://www.seriousaboutrl.com/why-has-rugby-league-never-taken-off-in-liverpool-28694/