No, but a lot of editors have some level of vim emulation (eg, Atom, or IntelliJ, or VisualStudio, or XCode) that always comes up a bit short. The point the author is making is that this actually embeds vim and is not a re-implementation of vim features.
I think that was a reference to MacVim, maybe?
This project uses the MacvimFramework. It might be a dig at Sublime/Atom's re-implementation of Vim keybindings
MacVim is emulated? What does that mean? I thought it was a graphical interface like GVim just with a couple of OS X keyboard shortcuts.