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Good point, some land is indeed ill-suited for agriculture. But food production through animals husbandry requires much more land. According to the FAO 33% of cropland is used to produce feed for animals.

Also from the same source:

Globally, there is enough cropland to feed 9 billion in 2050 if the 40 percent of all
crops produced today for feeding animals were used directly for human consumption

Which is why I was curious about the statement that agriculture alone could not feed earth's population.

it says 33 years from now i believe. Food production through animal husbandry is done on those barren-lands, i my Country Nigeria; the Northerners owns the largest Animals transported to the Cities where they are sold, why; because they have huge land mass not suitable for Crop production but they utilize it for Animal rearing.