Strictly speaking, it doesn't. Jambler doesn't act as a mixer, in and of itself. For partners, yes, it takes property, and yes it returns roughly the same plus a profit, but it nowhere says that it improves their privacy. The point of being a partner is to earn profit.

I could go on, but I don't think it matters, because it seems that you've made your choice. You could slightly change the criteria in the OP and it'd be rightly considered a mixer. You can't beat the admin.