Appears that RemovedAbandonedClosed is added after the date of the question removal, if the question is deleted by Community.
Though it acts as a reason of removal (:P), I doubt it's intentional?
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Intentional or not, I find this very useful. Deleted questions aren't visible to regular users, so putting useful information about the deletion directly visible to viewers is a good point.
The text might be formatted a little better, maybe linked to some FAQ about the Roomba script, but besides that: please leave it there!