I believe you may be using a vernacular definition where others are using a technical definition from economics.

In this context "scarcity" does not mean "There is not enough stuff", though that can be implied. It means there is a fundamentally limited amount of stuff and the aggregate demand is greater than the aggregate supply.

Given that the demand for resources is functionally infinite, I think this is basically accurate. Your objection to the existence of rich people is an objection to part of the aggregate demand, rather than to the description of resources as scarce.