Yeah job specialization is actually one of the "secret sauces" that Marx identifies as allowing capital to be so productive under capitalism so it totally going away isn't likely, but I think (and again all speculation here) he's getting at is that you don't have to be just a hunter or a fisherman or whatever. That your means of livelihood is not tied to just being that one thing, and you can do many things. You don't have to spend 40 or 100 hours a week being a garbage guy under threat of starvation. The beginning of the quote I posted above kind of supports this.

For as soon as the distribution of labour comes into being, each man has a particular, exclusive sphere of activity, which is forced upon him and from which he cannot escape. He is a hunter, a fisherman, a herdsman, or a critical critic, and must remain so if he does not want to lose his means of livelihood; while in communist society, where nobody has one exclusive sphere of activity but each can become accomplished in any branch he wishes, society regulates the general production and thus makes it possible for me to do one thing today and another tomorrow, to hunt in the morning, fish in the afternoon, rear cattle in the evening, criticise after dinner, just as I have a mind, without ever becoming hunter, fisherman, herdsman or critic.