It's absurdly generous in terms of the subsidies it permits, especially to Developed countries.
a) They were wrong; or
b) They were lying; or
c) They could have come up with an alternate way to legally subsidize you with 10 minutes thought.
Unless you're asking for a subsidy directly linked to how much you export, or for the government to establish price support (and even then, the EU has 80 more billion in AMS to burn), the WTO rules aren't the problem.
That's a pretty marginal use case.
He wouldn't put it this way because he's a grown up, responsible scholar, and a functioning adult, but I'd summarise it as "Go Nuts, YOLO!"