Before it can get deployed on servers, the proposed change needs to be accepted (someone with rights has to say +2 in Gerrit) and merged into the codebase. Also see https://www.mediawiki.org/wiki/Gerrit/Code_review/Getting_reviews . Wikimedia in general has room for improvement when it comes to code review, yeah. :-/
Sorry for taking much time to do this, but because of personal things to do in real life I wasn't active on Wikimedia projects.
I scheduled this Wednesday, May 29 for European Mid-day SWAT.