If the post was indeed made by the sundialsvc4, as you suggest, that leads us to two more unsolved mysteries:

• Was it done deliberately (to avoid the obligatory "seven" down-votes) or accidentally ("the system logged me out")?
• Why is it when posting anonymously, he uses "these double quotes" yet when posting as himself he uses “these double quotes”? Could it be somehow related to this?

More mysteries to keep me up at night.

Update: Aha, found a smoking gun that indicates at least some of these recent anonymous posts were deliberate! This node uses “these double quotes” and was done accidentally as indicated by the follow up. Therefore, recent "anonymous" posts used "these double quotes" in a childish attempt to disguise the true author.