You linked to a post which talks about regular Emacs, not Emacs with evil-mode emulating vim.
With the latter, it's every bit as composable as vim, as you can use vim keystrokes to edit in Emacs.
Take the "dt>" example from the post you linked to. You can do that directly in Emacs using evil-mode by typing those exact keystrokes. There's absolutely no difference.
[1] - http://www.emacswiki.org/emacs/Evil