Not one bit surprised by this, SF said before the election that the Status Quo would not return, that meant serious work from the British/Irish government and the DUP with SF, it never happened, they are delivering on their election promise. If you voted for SF, they are delivering on their election promises.
What does that mean? They keep repeating it but it is not clearly defined. How can you negotiate without defining what is meant by the status quo not returning?
I took it to mean they would stop rolling over and letting the DUP tickle their belly