Fine.
The notion of net benefit is quite broad—you talk about it in your document. It can have a financial aspect, in other words, money. I can understand why a witness, be it him or anyone else, would not want to discuss it. Still, I want to understand the overall principle, not necessarily the one that applies to his testimony, in particular.
Does the so-called “privilege not to talk” apply to everything around the net benefit? Could anyone assert their right not to discuss anything related to the net benefit, by claiming that it could be prejudicial to them? Or does that right extend only to the financial transaction—it would indeed put him at a disadvantage to discuss that aspect—and he could discuss the matter of compatibility with Canada's cultural policies, for example, or some other aspect?