Did Dom cheat when it was his turn to do the public transport choir?

Dom Meg and Randell 04/07/2019

FINALLY Dom's turn came to jump on a bus and sing his heart out and try and get people to join in. BUT it seems that he broke some rules that he made Meg and Randell stick to...like, not telling people that he was doing it as part of a radio thing. What do you reckon?