I find their tone,as reported, to be outrageous,and bordering on the disrespectful to Marcus Leibherr's family.
The Liebherr's are under no obligation to be answerable to a group of bumptious knobs who behave like 1970's shop stewards always seem intent on promoting a confrontation where none should exist.
Perhaps on reading of this the Liebherr's should just say "sorry,can't meet your requirements so we'll walk away.." or just "b0ll0cks to it" . I wonder where that would leave the shop stewards,and what they might seek if that happened.