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The parent's point is that an economic simulator that does not include them is probably not something that's useful to draw conclusions about capitalist societies from.
It is a fun toy, though.
That's not really true; people who own and profit from their ownership of the means of production exist in feudal economies; the fact that their ownership of the means of production is a sonetimes a consequence of rights associated with land tenure and, whether or not that is the case, not marketable or less freely so than under capitalism the capital, makes the system not capitalism, but doesn't make the owners of capital not capitalists.
Capitalists qua capitalists aren’t the ruling class outside of capitalism (though being a capitalist was also a subordinate part of being part of the labded aristocracy, and control of certain elements of the means of production was connected to land tenure), but they still can exist. Capitalism as a system is mostly a result of the non-landholding capitalists progressively leveraging their existing wealth to gain more systemic advantage (at the express of the landed aristocracy) than they enjoyed in pre-capitalist economies.