I was looking through someone's edit history and I was looking at this review:
Why does it give this notice, while at the same time saying that it's a high-quality post?
Precisely because it's an audit. The point is to see if the user is paying attention to the post itself, not robo-clicking to earn badges.
It would have been marked automatically (through an algorithm) as being potential spam.
The quality mark would have been given by human intervention which spotted that it wasn't spam.
It is being used as a clear cut example of whether you would do the same and are paining attention and are acting more like a human than an algorithm* ;)
*knowing these are not entirely exclusive categorisations.