The posts that got deleted were made by @Ghost_of_Ninja, somebody who apparently has a history of making posts and deleting them after that (most of them get refuted apparently, from the climate change thread).
The thread is not quite monitored by staff I reckon, it's mostly monitored by @btickler as we all know, he's doing a similar job though. The only difference is him not having access to staff extra features like deleting or editing posts. Whether mods check the thread out every now and then, that's a possibility.
"This thread is heavely monitored by Staff to deter from mis-truths in the medical profession."
I would be curious to know more about that 'monitored by Staff'.
And also more about what posts have 'been deleted'.