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It requires the members of the compact to direct their EC votes to the winner of the popular vote.
That is already the policy in most states. Where the EC goes wrong is when one state, with 10 EC votes goes bigly for one candidate, while another state, with 11 EC votes, goes slightly the other way. The two states combined, the candidate with the most votes, got 10 EC votes. The candidate with fewer votes, of the two states combined, wins 11 EC votes.
There are, occasionally, issues with EC members not voting the way they said they would vote. Usually, the state legislature designates which slate of electors gets to cast their votes. There is potential for the legislature to ignore the vote of "We The People", and select the slate pledged to the other candidate. Whether that can happen, or not, depends on how the state law regarding the EC is written.
Steve