iTerm2: Alt-Dot functionality with Cmd-Dot

This looks like part of the EMACS readline bash key bindings i.e. they appear to be key combinations that are used in EMACS and emulated or add-ons to bash, or something. Mine work as yours do, unfortunately, but I have a workaround since you are speaking with respect to iTerm2:

Go into the Preferences for the profile of the Terminal session you'd like to inflict this upon, and establish the key-binding as illustrated thus:

This is probably not the solution that you are looking for, however it should work for you in a pinch.