As discussed in our weekly meeting, this is a hard feature to implement, because we do not currently track the names of people who add deletion tags in our data tables.

So we are lowering that priority for this proposed enhancement accordingly.

I agree that this would not be simple to implement. Would have to do an API query on every hover, or store this info in the pagetriage_page_tags table and prebuild the popups. The latter is how we do it for reviewed articles. The code is in modules/ext.pageTriage.util/models/ext.pageTriage.article.js -> formatMetadata()