The point is ATSB said everybody done good. To me this means the lateral movement must have been authorised, or somebody has decided it is fair enuf. I don't know which.
If you are correct and lateral movement may compromise the integrity of or prevent an RA, then this is shocking news and controllers all over the world that have absorbed what was thought to be the lessons of Lake Constance need the news now. Otherwise they are poised to make compromised separation situations worse by emergency vectoring.
Are you sure of your facts, or just wafting from your armchair?