What I've been assuming that means is that the content of the stickypost won't be affected by style=mine, the way the custom text module (or various other ways of adding sticky text into your journal via layout fuckery) currently is.

Which means we can debate the extent to which the stickypost obeys style=mine when it comes to formatting (for example, I have custom CSS that shows bold text in a different color. I would expect stickypost.html?style=mine to obey the viewer's CSS for bold text, not the OP's).