This guy explains it. A bunch of blue states passed laws to automatically award their electoral votes to the winner of the popular vote. Right now, these states' electoral votes add up to 222 electoral votes. Now with more states with Democratic trifectas, we have enough states with more than 270 electoral votes added up to render the electoral college irrelevant.
It sounds like a non-starter. The Supreme Court has not ruled on it. With this Supreme Court, it will be dead on arrival. Five of the six conservative justices owe their seats in the Supreme Court to the Electoral College.