key word is reasonably there. if you are a brain surgeon being asked to clean the toilets would not be reasonable. if however you had some job related to cleaning or maintenance but toilets wasnt part of your specified job description then one could argue that cleaning the toilets might be...
it has been pointed out several times in this thread that the offer could have been for Gus to buy out his contract for a certain sum or any number of other scenarios
exactly.
i suspect an offer was made to Gus (not necessarily financial) to sign a compromise agreement - everyone keeps whats left of their dignity and its all confidential. Gus (presumably on advice) has told them to shove it and has called TB's hand. My gut is that Gus will get sacked on...