I read that technical update too, and I saw that error too. It also lead me to the conclusion that the edit-count thing, whatever it was for (didn't know it was for loading Chat.js back then), didn't work anymore. However, apparently Wikia lied to us because if you remove it Chat.js isn't loaded. To confirm this for yourself, simply go into chat, then remove the edit-count thing, then refresh, and see that it has changed and none of the scripts are working anymore. Maybe Wikia should be contacted about it, because I think Chat.js and .css should be loaded automatically now, but they aren't.
The edit-count thing is parsed as html inside the chatroom.