I'm not sure what it means to "sit at this board", but why didn't the R inspectors pull up a chair and sit or at least stand "at this board".
Were they physically being threatened?
Were they locked out of some board room?
Don’t know if it is true or not, but I heard they were not allowed in the door.
I believe they were put outside the area where they could observe what the poll workers/voters were doing. That was a very consistent theme in the heavy democrat areas. Vote counts done where no one could watch.