No, actually its irrelevent to note that erroneous opinion. Each state's electors are chosen, and behave, as per state laws. Federal law cannot regulate how the states vote.
That sidebar was in reference to punitive laws for "faithless electors." The SCOTUS has largely, as it should, deferred to the states in their regulation of electors, but the punitive measures -- fines, etc., for those not voting for the popular vote winner -- has never been challenged.