The DF was reversed
I wouldnt be surprised if it does result at times in lack of disciplinary action and/or lack of announcement. I was mostly commenting that I would be surprised if anyone actually succeeded in a lawsuit.
In the US, there is actually some authority in some states for action if a church doesn't follow it's own procedures in removing a member. For example, if I remember one of the cases involved a church rule that there had to be a majority congregation vote to expel someone and the church leaders did it anyway without the majority vote. Your story sounds like it might follow those lines. Very interesting.