It was reported in another game a few days ago that there is now a rule that if a coach has to be restrained by an assistant it is an automatic T. Don't know if that was accurate or not.
Not accurate. It is possible that a referee might decide that this action falls into one of the various supposed conduct violations, cited in the rules, most of which are not deemed to be technical fouls:
c. Prolonged, negative responses to a call/no-call that are disrespectful or unprofessional and include, but are not limited to, thrashing the arms in disgust, dramatizing contact by re-enacting the play, or running or jumping in disbelief over a call/no-call.
d. A negative response to a call/no-call including, but not limited to, approaching/charging an official in a hostile, aggressive or otherwise threatening manner, emphatically removing one's coat in response to a call/no-call or throwing equipment or clothing on to the floor.
e. Continual criticism during a game regarding the same incident after receiving a warning from an official.
f. Taunting, baiting, ridiculing, finger pointing, trash talking or inappropriate gestures (obscene, provoking and intimidating).