Seems to have been introduced by 7960d5385f1146459671148e2e34d3ba50e17aeb, which moved the location of the (nowadays deprecated) WikiPageDeletionUpdates hook.
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Still present in master (L3903). The associated code comment notes: TODO: hard deprecate old hook in 1.33. master is now on 1.36 so maybe it's time to do something about this?