I have no particular objection to the withdrawal of a bounty, specially if offered by a mod and even more specially by one who has lost about 30k rep in good causes, but I do rather object to incorrect guidance. Given bounty emboldens both of:
All bounties are paid for up front and non-refundable under any circumstances
can we at least have a footnote on that page that mentions there may be very exceptional circumstances in which bounties are refunded?
yet bounty award does not show for any Answer to that Q. At present it does not even show any answer though I think there was an attempt at one (that I did not accept as it added nothing of value, IMO). But even if there was an A at one time I am convinced it was not from the bounty awarder (from whose profile I took the image above) and You cannot award a bounty to your own answer anyway.
I have a feint recollection (though it might just be imagination) of a case on SO of something like a bounty being put on a duplicate question that was then merged or deleted and a mod mentioned that they had refunded the bounty accordingly. As mentioned, I have no objection to mods being able so to do. (Or it might have been a bounty, not from OP, put on a Q that the OP had requested be deleted for breach of confidentiality/risking sanctions from employer or such like.)
The current choice of Title is not mine. Although quite well hidden, one of the bullet points here from March 4, 2012 is:
They can (at their discretion) refund and cancel a bounty.