Interesting, though the duration is short. I was wondering what is happening in the Chinese board. Is the deletion of more than 200 posts happening on a daily basis or only special for this particular range of dates?
There is a pretty big clean-up taking place over on the Chinese Local Board, that has been going for some months (see
https://public.tableau.com/shared/63RSPTF3S?:display_count=yes&:origin=viz_share_link). Most Net post count is negative recently, with a large focus on Altcoins and the Main board (this latter could be moving threads to their proper childboards).
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It depends on exactly at what time he got each reading: If all readings are taken at the same time each day, it would be 3. If first reading is early on the 28/08/2019 and last reading late on the 31/08/2019 then it is close to 4. Maybe OP can clarify.