There are new conditions there haven't been before. It's never been possible up to now, but we are moving into unknown territory.
This certainly isn't true simply because you state it as a conclusion without any reasoning or support whatsoever. It has never been possible up to now, because it isn't possible. There are no new conditions that change the principle that the only thing of value a human has to offer in trade for money (or, in other words, in trade for the labor of others) is their own labor. They have nothing else to offer. Ever.
There are a lot of unknowns, that is true, but certainly not with the principle I just mentioned. What is actually unknown is how long people will cling to beliefs that they cannot support.
How do you define labor though? Playing WoW is labor if the coins in WoW can be spent to buy real world items.
The difference is people will be able to do what they want to do because the basic necessities are free. Very few people will choose to do nothing at all except maybe drug addicts, depressed persons, etc.
The people who are depressed or with drug problems is not the vast majority. So as the vast majority has more free time then we will have more art and people playing sports, games, and other kinds of jobs. Work will be between 10-20 hours a week because no one really needs to work more than that and productivity doesn't improve working more than that unless you're trying to start a business and there is literally no one else to do it.