There can't be any conclusive proof on something like this, but Dein's insights on Wenger and statements on the money situation have a lot more weight than yours or mine.
And if you're going to just flat out accuse him of lying so you can continue to believe what you've already decided to be true then fine, there's no real point in discussing it further.
It's easy to prove yourself right if you ignore anything which contradicts what you've already decided.