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Examples for unreleased works do need to mention the trailer where the trope is seen, but it should be incorporated into the example's text itself, not awkwardly tacked on at the end. So "In this trailer, we see this trope", not "This trope happens (trailer source)".
Yeah, I figured about the trailer theme, but Ashlay's way of doing it seems lazy.
They're probably doing it to make post-release edits to those entries easier. It's awkward to have entries on a work still saying "in the trailer such and such" after it's been released, so this is probably so that those parts can be removed quickly when the time comes.
It isn't inherently awkward, you're just not used to seeing marketing described on the work page. Just because the work has released doesn't mean those entries can automatically remove "in the trailer". The work has to be directly observed before you can add information about what happened in the work. We know that there are tropes in trailers that never occur in the work itself.
Link to TRS threads in project mode here.
Besides, trailers are still tropeworthy works on their own- so just slapping "(trailer)" at the end of an example is just a poor writing practice; imagine going to a Literature page and seeing every example marked with "(chapter 4)". It's a way of citing things, sure, but it's not nice to read.
Currently Working On: Incorruptible Pure Pureness
Ashlay did a bunch of edits on VideoGame.Doom Eternal where they put they include the trailer at the end of each entry. For example:
I guess this is a moot point since the game is coming out this week, but are these notifiers allowed?