I had "vaccumed" all indices referencing those entities before issuing a delete. Albeit, there was only once index per purged entity type. So this would not explain the 20x write operations.
Also, note that the deletions were through the "Datasore Admin" app, which was recently added. It is different from the classic Datastore Viewer.
Also, note that the deletions were through the "Datasore Admin" app, which was recently added. It is different from the classic Datastore Viewer.