By workers he clearly means labor unions. Individual people who are not engaged in the revolutionary struggle or the defense of communism should not have access to guns (or any weapon for that matter). Western leftists, particularly American ones, have liberal brain worms because they intertwined this with the second ammendment. Not everyone who is a worker should be entrusted with a fucking gun, the organizations that represent workers however should. Its the same argument with cars, are cars bad? Not inherently, but we as a society should be phasing them out. Western leftists listen to China challenge (HARD)
https://www.youtube.com/watch?v=OCiMcg-Kw14
Just wanted to drop this video here that explains the background of gun ownership in China, this guy has some cool stuff. It goes over the years post-revolution up to some examples of the gun violence that eventually led China to severely limit individual ownership of guns.
But where can a leftist in the US actually participate in collective gun ownership? I don't know of any organizations that are able to practice that. There's a few projects that may lead to that (looking at you, Comrade Center). But as it is now, individual firearms ownership is all there is; honestly if someone believes it's necessary, can handle a firearm safely and understands the risks of harm to others and themselves as a consequence of their ownership, owning a gun can make sense.
I think gun control in China works because the workers are in control of the state, the military is in serve of the party so there's no reason for individual workers to own guns. That does not mean there isn't guns in China. I'm just stating post revolutionary society should strive for gun control.