DENYING and DISBELIEF are two different things.
Logically speaking, mere disbelief in the truth of a proposition cannot be treated as equivalent to the belief that the proposition is false and that the opposite is true. If you make a claim and I disbelieve it, I am not necessarily saying that your claim is false. I may not understand it well enough to say one way or the other. Or I may lack enough information to test your claim. Or I may simply not care enough to think about it.






