I agree that the rigid 9-5 is not fulfilling for a lot of people, and would even go so far as to say we'd be happier as a whole if we could work outside of that prescribed structure.
I have to assume this person is being massively facetious with the tone of this tweet though. Obviously it's twitter so it's nonsense, but no, you wouldn't just shoot the shit, pick some berries, and then chill out. You never been farming? It's miserable, hard work. And when I was doing that, it was safe in the knowledge that I had food in my fridge and cupboards, so I wasn't totally reliant on the food I could pick. And that's farming, i.e. an established plot of land where I know food is meant to be, grown by me and people before me, that I should be able to pick from.
If I was scavenging, on unknown land? No fuckin way dude, honestly call me a weakling but I'll work a 9-5 if it means I can afford (and have the opportunity to pick from a decent variety of) fair quality food, have decent leisure time to myself, and not have to worry about whether the food I'm picking, if I can find it, is gonna make me shit myself to death.
I have issues with the system, massive issues with the system, and I recognise I'm privileged to be in the position where my 9-5 makes me miserable but not suicidal and where the shops around me stock a variety of food, year-round, all of which I can try with a little bit of careful budgeting. It is definitely better than dying of bad berry disease in a god-forsaken cave.