No, I've completely missed that part entirely, and I've certainly never mentioned that Zane actually pushes away the mists. I've mentioned Zane has a spike--which, to be fair, I had missed before I came to TWG and reread WoA after learning of that. It's one of those "Wth, that's actually IN there!?" moments.
As I've said before, I have never EVER liked Zane. Rereading Well of Ascension, and I still don't like him. My brain must automatically tune out that way.
So, what does that quote tell us? Mists can be moving towards you (from the Allomancy), but it can also be pushing away simultaneously. Obviously, the spike (plus Hemalurgy) is the thing that is causing the mists pushing away. This tells us something: the more metal in your body, the more the mists push away, because of course, Steel Inquisitors have more metal and it is blatantly obvious that they are pushing the mists away. With Zane, its barely noticeable.
That could be the biggest thing about Hemalurgy we've figured out as of yet.