I don't think there's a disagreement; the author states "Whenever I look at mocks, they mostly have the same problem as all unit tests that I see, they only mod

I don't think there's a disagreement; the author states "Whenever I look at mocks, they mostly have the same problem as all unit tests that I see, they only model the happy path". So by corollary their opinion of the correct usage of mocking would also include modelling brokenness.