Those faithless elector laws are meaningless.
The law is never meaningless, unless you're a Democrat.
They are not generally meaningless. But if were revealed, authoritatively, that the candidate they were pledged to was not eligible to the Office, who would enforce them against those who refused to vote for a person who was not eligible? Many may have "outs", such as one for the case where the person they were pledged to dies before their vote or otherwise become unable to fulfill the duties of the office, which could certainly be argued to include being ineligible. In other cases, such as California, the electors are pledged not to an individual, but rather to the candidate of a party, and if the party wanted to survive, it would instruct it's electors to vote for some person other than the ineligible one.