According to electronic translation, the sentence
Je doute qu'aucun d'eux ne comprenne ton discours.
I doubt any of them understand what you're saying.
This translation may not be perfect, but is its general sense correct? (I.e. the speaker believes that none of the listeners understands.)
Assuming the answer to the last question is close enough to "yes", how would one say this in French?:
I doubt any of them does not understand what you're saying.