The user profile indicated DBA as the only community. Is this used only for DBA or are there any other instances for other communities?
It's hard to prove a negative but I haven't encountered any other sites in the network where such a bot is active. Comments get converted to (sometimes wiki) answers all the time, but usually under the 'main' account of the user.
This particular account (not a bot, confirmed by the author) is run by one of the ♦ moderators; this has the additional benefit that he's able to delete the comment himself. (Though when run by a normal user, it could still flag the comment as 'no longer needed'.)