I can confirm that in those JKA tournaments in Japan it's not against the rules to make contact. The objective is still to land 1 clean strike to score a point though, and the technique has to be executed properly. If it lands clean and hurts the opponent you don't get warned or disqualified as long as it's a legal technique executed properly.
I haven't seen such a tournament in Europe where contact is not penalised though (I did 2 years with JKA as a teenager before moving house and having to switch to a WKF dojo), but that doesn't mean it doesn't exist.
So it's not just your word against spacetime the shit talker, it's also my word + your word vs his.
Have a nice day