Well done to South.
Should have a great season I hope they do.
As for A League NSL etc, you cannot ignore the NSL Dooks if players who played in the NSL are still running around in the A League and they count their first team appearances in NSL and A League.
So in reference to your question how many A Leagues have South won, more pertinently would anyone devalue the old English Division 1 when it was the top tier of football and are those championships won worthless or is it because in 1992 the English FA revamped the structure of English Football and inaugurated the Premier League and it is only after this inauguration that English Football should only be remembered.
South Melbourne are Australia's most successful football club.
It matters not on the running of the NSL or the A League now for that matter what is more applicable is that the NSL, championships appearances goals etc has counted and will always as a statistical status be counted as a senior football competition in Australia regardless of whether it is defunct now or not.
If Gold Coast never play again after tonight do we not count the appearances or the goals for those players or furthermore anything that any player contributed to the North Queensland Fury.
For many Football in Australia started in 2005/06 with the beginning of the A League and soccer was only a term left to describe the competition when it ran under the moniker of the NSL prior to that.