It isn't an open question. The laws have been upheld as they are state electors.
There is no federal law that requires electors to vote as they have pledged, but 29 states and the District of Columbia have legal control over how their electors vote in the Electoral College. This means their electors are bound by state law and/or by state or party pledge to cast their vote for the candidate that wins the statewide popular vote.
Your link illustrates the correctness of my claim. Read it again.