This says a lot, but doesn`t actually tell you anything at the same time.

Essentially it says, compress things, but use an oscillator to watch how the signal is affected. Oh, and maybe try to mirror the look of a well mixed tune.

DOn`t wanna sound moody but it`s actually a pretty crap bit of advice.

Talking about how to tune the attack and release would be a lot more helpful for this tutorial considering it is talking about heavy dance music mastering comp.

Trying to copy the dynamic image of another tune might not be appropriate for what you are working on anyway.

Nope, as a rule I would say oscilloscopes and spectral analysis is less effective than watching the gain reduction meters and tuning your attack and release appropriately.