It's not surprising that he now wishes things were different, since he has almost certainly spent all the money. When they were waggling the giant check in front of his face, he apparently had no such qualms. And in fairness, back in 1996 he probably had not idea that 20 years later the American people would remain so ignorant that a significant percentage continue to believe that burning fossil fuel does not contribute to global climate change. If only there were credible celebrities with science backgrounds to explain these things. Hmm.
But forget selling out to a giant oil company -- arguably Exxon-Mobil is the most powerful entity on earth, so who can say no to them? But why in the world would Bill Nye The Self-Proclaimed Science Guy allow anyone to believe that oil is "dinosaur soup"? Saying that oil is "not exactly" made out of dinosaurs is the sellout's version of saying that oil is "absolutely not" made out of dinosaurs. I wonder if he wishes he had approached that differently, as well. Now multiple generations of kids have learned from him that oil is awesome because dinosaurs, and climate change is nothing to worry about.
Anyone visiting this attraction to receive an education should listen carefully to the cranks who are complaining about the attraction after it is over. That is the only legitimate chance you have at learning something accurate from this show.