Read back through any of my posts over the years and I have always said roosters crowds are atrocious. But our crowds are far from the worst and when people make ridiculous statements like T boon I will point it out. The facts are that the swans played many games there and averaged better crowds than they do at scg. They are the only facts on offer. Even if swans moved to Anz and assuming you are right and their crowds dropped they’d still pull 20-25000 which is still far greater than dogs and particularly souffs. His argument is that the roosters are responsible. It wouldn’t matter where swans played in Sydney they’d outdo all nrl teams.
Using subjective wording like "many games" isn't factual. I pointed out the facts in my previous post about number of matches played at ANZ Stadium vs SCG and there is a serious disparity in the figures you're quoting.
Putting aside the fact Sydney wouldn't move to ANZ, it's worth noting that of course they'd average more than Canterbury and Souths because they don't have 7 other clubs in the same code vying for bums on seats. AFL fans in Sydney theoretically have a choice between two clubs, and so far most seem to be sticking with the Swans. Again - supply and demand.
I must say, using the Swans to try to claim the NRL clubs at the higher end of the attendance average scale are doing poorly is odd (and not really relevant). One of Canterbury and Souths have been in the top four average home attendances each season dating back to 2008, apart from I think 2017 where the Dogs were 6th or 7th and Souths were last.