Exactly right. It is the propaganda by radio people like 5AA that obviously screen the callers to skew the impression the way they want. Officially 93% of Power supporters indicate their allegiance to the black and white.
And the majority of the rest likely don't even follow an SANFL club.
This is another example of people like Stephen Rowe and Graham Cornes elevating the SANFL to a level of consciousness in peoples hearts and minds that in reality it simply doesn't occupy in this day and age.