That essay is not well worded. They're confusing property in general with land specifically, with wasn't universal across the States. As I understand it, some States' property requirements could be met with non-land assets. See [1] for an interesting overview of the situation in New Jersey. The following quote makes no sense if property was restricted to land-only:

> Today a man owns a jackass worth fifty dollars and he is entitled to vote; but before the next election the jackass dies. The man in the meantime has become more experienced…and he is therefore better qualified to make a proper selection of rulers — but the jackass is dead and the man cannot vote. Now gentlemen…in whom is the right of suffrage? In the man or in the jackass?"

> -- Attributed to Benjamin Franklin, taken from “The Casket, or the Flowers of Literature, Wit and Sentiment,” 1828

[1] https://www.amrevmuseum.org/virtualexhibits/when-women-lost-...