"we know that how?"
10/10 for loyally defending the indefensible, wiggy, but
a) Was any 'safety issue' raised by the crew with ATC before line-up?
b) Did the crew respond 'unable' to the order?
c) Did the a/c subsequently enter the runway and take off without an emergency?
I grant you the cheeseboard may well have been jamming the throttles.
I am pushed to think of a 'safety issue' that prevents you from taxying and prevents you from communicating it to ATC. I think the rest of the world would probably agree.