I would say stay positive and who knows his wife might have change of heart and go with him to the landing interview...after all she hasn't called cic to tell them that she wants to withdraw sponsorship till yet ....so who knows...
She can do what she wants , but if the relationship has broken down, and based upon the information provided, it has , she and or the sponsored individual has a obligation to inform the government
It’s not rocket science
Relationship intact = sponsorship proceeds
Relationship breakdown = sponsorship ends
It’s not about being “ nice “, or are they are still on good terms
The gentleman is aware and is adamant there will be no fraud