I don’t get it, I’m not sure what to believe because the news headlines say Biden won the electoral college
Always believe the news headlines. They never lie.
The word alternative means Republican in opposition to the Democrat electors. They did this so that there is a conflict between the two groups resulting in a Mexican standoff. In which case, the election would be thrown to Congress, one State / one vote, with the majority Republican State Legislatures having the upper-hand, President Trump wins.