

If he had said, “I don’t believe you. I think you’re denying it publicly, but in secret you have probably already directed your engineers to lay out the groundwork,” that would be fine.
He would be accusing her of lying, rather than assuming she was an ignorant female nobody whose knowledge could not compare with his insight of, “but other companies did it.”
I choose guilty sex.
It makes it a little raunchy, without explaining why.