You don't seem to have read the links in the OP. This is nothing to do with self-ID. It's about education. This is from the facebook page of the organisers:
Hands Up Scotland is a group of parents, friends, teachers, and university lecturers concerned about the politicisation of Scottish education. We believe it’s time for a genuine, open, discussion about changes taking place in Scottish classrooms.
The quality of Scottish education (primary, secondary and HE) appears to be declining and attainment gaps are widening . We need a public discussion on education to create an education system that is open and tolerant. Government and teachers should not be indoctrinating our kids with the latest political fads, schools should strive for some sense of objectivity and provide our children with a range of differing views. Education in subject areas and history should help our children to develop a better understanding of their place in the world. A school should be place of learning, not a platform from which government dictates political values or teachers preach ‘activism’.
www.facebook.com/groups/199024469048342/about
I don't know any more about this group, but perhaps if you do you could share it here.