You are still thinking in terms of monetary economics about a situation where money is no longer needed.
In a monetary economy, if you need X, you need the money to buy it. In a post-AGI economy, if you need X, you ask your human-level robots to make it (including making more robots). No money involved at all.
Like they will magically create metal and food from nothing? Of course not, you will need to barter for those if there are no money.
Will they create also water that will be getting more expensive due data center consumption?
This is absurd.
Money is just an abstraction for resources. You'll still need land, energy, minerals etc.