There were statements multiple times, some said “doesnt count, because this was long ago”.
I made this thread to get the latest POV from Blizzard on that topic:
People will argue either way, copium.
The overall sentiment (based on what we have read from Blizzard and their actions - not banning syncers) is that it is NOT illegal or breaking ToS or a reason to be banned, no one has been banned because of queue syncing ever.