Does it really refute the propeller inspiration?
I don't think the tie to the previous logo border necessarily excludes the center being a representation of a propeller. They didn't describe the thought process going in to the blue and white, just stating that they were the Bavarian national colors.
Why not horizontal or vertical stripes? Why not the diamond shapes often used in Bavaria?
Unless there is a documentation of the process of developing the new logo, we can't state definitively where the inspiration came from. I think there is still a good chance it was inspired by a propeller.