This is information about southern Asia, not northern Asia. Rather than resolve the paradox, this states that the paradox does not exist in a different region.

This deepens the paradox by implying a warmer, more humid climate should result in greater crop yields. If plants rely on carbon dioxide to grow, and the impending changes will result in more carbon dioxide in the atmosphere, then crops should benefit.

This is a reason to expect crop yields will decrease. A consistently warm and humid climate will benefit pests, which over the long term may cause damage to crops that outweighs the potential benefits of a changing climate.

This deepens the paradox by further implying the changes in climate should cause crop yields to increase, not decrease. If a warmer, more humid climate causes edible plants to flourish, crops should not be expected to suffer.

This does not explain why crop yields are expected to decrease over the next century. If changes in climate happen to allow more winter farming, that would be expected to increase yields, not diminish them.