International comparisons are tricky, and you should always check the data definitions carefully.

The first metric on that page is household income divided by the square root of household size. That has some unreasonable consequences. For example, if housing is unaffordable, children live longer with their parents, and measured income is higher.

The second metric measures either net income or consumption, depending on the country and the year. It takes taxes, benefits, and purchasing power into account but fails to consider savings and subsidized services.