A claim’s power to persuade is distinct from its truth. A skilled speaker may persuade many listeners, but misattribution or weak indications can leave the argument unsupported.
Acceptance: listeners come to endorse a claim.
Truth: the proposition corresponds to reality.
Validity: the conclusion follows from the premises in the required way.
These require separate evaluation. Classical rhetoric describes a kind of argument; it does not imply that truth and logical coherence cease to matter.