I have watched all the Australia Open matches on bet365 itself and some of the matches they show are even ahead of the stream that is being shown on TV so it was a great experience with the method you shared.
It was even faster in the previous seasons for many sports, but they deliberately added a delay to their streaming service now. Spanish La Liga and Italian Serie A was faster on bet365 than on satellite/cable. That is no longer the case. German BBL basketball, Austrian and German Bundesliga - same thing. There is now an artificial delay probably to prevent players from having any sort of edge.