Hindering the efforts of workers to organize against their capitalist bosses is literally the opposite of what a communist party is supposed to do.

There's been at least one time where Chinese workers straight up kidnapped their bosses and held them hostage for a week over a labor dispute, and the CPC explicitly said that it wouldn't intervene, which was effectively them siding with the workers in that scenario. So I don't think that the CPC has a problem with workers fighting back against their bosses so much as they have a problem with organizations forming inside of China that can wield political/economic power independently of (and thus potentially against) the CPC.

Also, from a bit of research, it seems like there have been plenty of well organized strikes among Chinese workers in the past, even without official unions. Maybe things have changed since then, but it would seem like the guy the article is about shouldn't get jailed just for trying to organize workers against their bosses.