There's no way UFC will hold his last loss against him given the 11 days notice and the fact he was fighting a top guy in a higher weight class (and did quite OK).
Usman agreed to fight Chimaev because of the huge payout. This is natural because Usman has won in negotiations. This defeat was also beneficial for Usman because it could be assumed that Usman lost this fight due to lack of preparation. Chimaev has been training for months at the training camp, while Usman has only started preparing for the Training Camp in just 11 days. And one more thing, Usman has received a very large fee from the UFC (I don't know how much) to fill this fight.