You see, Rooney's actual topic was that Trump lied 7500 times. He just used a set-up in the subject line for the main topic. It wasn't a thread about some MSM gaffe where he decided to change the topic to Trump using whataboutism.
Also, it's not whataboutism because the comparison is specifically relevant. Trump accuses the MSM of spreading fake news (and being enemy of the people), and so the fact that he lied 7500 times goes directly to the credibility of his claim.
That's quite a bit different than discussing Trump's shady finances, and bringing up Hillary's shady finances as a defense. One does not affect the other. The fact that Hillary had shady finances does not make it more or less likely that Trump did. However, the fact that Trump lies makes it less likely that his claims of MSM fake news are credible.
Logic is fun. Give it a run sometime.