Iftirāʾ (fabrication) attributes intentional invention; the charge of madness suggests an impairment of reason or intentional control. Neither expression should automatically be treated as the whole philosophical definition of falsehood.
To accuse someone of deliberate lying invokes intention. To classify a reported proposition as false under the majority criterion does not require alleging deliberate deceit. The distinction blocks an easy inference from the two hostile alternatives in the verse to an exhaustive taxonomy of reports.