Given you seem to have more knowledge on it, what did happen? I am particularly curious about comms if you can shed some light?
Mutual traffic was given and acknowledged by both aircraft.
ATC met all of their responsibility regarding the class of traffic the aircraft were operating in. Not an ATC bash, far from it (well apart from the SME, that doesn't want to be an SME, that is passively being an SME)
This accident would not have happened, had the appropriate class of airspace been in place given the traffic density, given an ANSP that could staff the console, given an airspace regulator that had the gumtion to implement it.
I apologise to the precious petals that 'can't handle the truth'