The legislatures of Pennsylvania, Wisconsin, Georgia and Arizona, under election administration laws they passed, have ZERO say on whether elections are certified and their respective states send presidential electors.
No, the legislatures can't just authorize and send a set of electors which their state didn't vote for.
Their election laws, which—again—these legislatures passed, make it clear their states' electors are chosen by popular vote.
Their election laws, which—again—these legislatures passed, make it clear their states' electors are chosen by popular vote.
Some legislatures used to retain for themselves some power to select electors; but legislatures haven't been legally allowed to select electors since the late 19th century in any state.
Sure, in theory, the Supreme Court could just completely ignore all of this and allow legislatures to illegally usurp their own laws when choosing electors after Election Day.
But if we come to that, well, our republic is gone anyways.
But if we come to that, well, our republic is gone anyways.