I might be blind... but it says 2016 and 2017 MacBook Pros. Seriously though, take it to the Apple store and explain (nicely) that you would like this fixed under the staingate repair program. This is definitely part of that, and the coating is not supposed to come off like that.
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Has anyone ever been able to find a source for this information? It comes from MacRumors, and everyone just quotes MacRumors as the source - not Apple. I think MR should just note this in that post as it gets linked to a lot, MR seem to be the only people to have seen said document, and I'm skeptical about things that have a single source, especially when I cannot find anything on an official website.
Having said that, I don't believe the 2016+ models suffer from delimitation like the Retina models did. I haven't seen or heard of anyone experiencing the issue. I've seen plenty of "Keys imprinted onto display", which is often cleaned off with ease. The clearance is tight, so a build-up of dust/grease will leave a mark on the display, and if you never clean your computer this will give that appearance - and be slightly harder to clean off.
Either way take it to the Apple store and see, but understand the cause before you go demanding things as it won't end how you want it to end. Ask them politely if they could try cleaning it off, if they are unable to - then at least you have some proof that the display is damaged, and can go from there.