If I defended China it would have been. But I didn't. What aboutism is a rhetorical tactic to belittle the offenses of one group by pointing out similar enough offenses of another. Fuck China fuck the United States. The United States having done it doesn't make China doing it any better. Or vice versa. I literally said that in the first couple of sentences.
Simple comparison isn't whataboutism. Just like your disingenuous attacks are not good faith effort to debate.