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I deleted my data a few months ago and it happened fast enough that it didn't seem like there was a human in the loop.

yes, but the implementation may, as far as you know, look like

if (userRequestsToDeleteAccount || user.deactivated) { user.deactivated = true; showDeletionSuccessfulPage(); }

In this implementation, the user believes their data is deleted, but it has not.

add a "count 400" or something in there to make it seem like something happened.