They had to hear it. The Florida Supreme Court was allowing the Constitution to be violated.
So what?
The FLASC could not compel Secretary Harris to certify the Gore slate. The FL Legislature has the constitutional responsibility to direct the appointment of electors. FLASC has no role.
It is certain, whatever pretended decision came from FLASC, that the Legislature could have and would have appointed a slate of Bush electors.
When, on January 3, 2001, the President of the Senate announced that two slates of electors had been sent from FL, the Republican Congress would have chosen the Bush electors, as was their constitutional role and right to do.
This would have had 3 beneficial effects: 1) It would have followed the Constitution; 2) It would have diminished the power of the courts; 3) It would have increased the power of the People.
As it happened, all of the effects of USSC sticking its nose into (another) political question where it did not belong were bad.