There's an argument that the problem with the Tomato is lack of Nitrogen. Another argument suggest a lack of calcium. Another asks whether or not the Tomato was planted with a fish head. And there's a whole thing that gets to be endless.
My own view is that some years are not good for Tomato and some Tomato are
better than others at managing swamp like conditions. A fatalistic view
possibly. Or maybe your gardener's achieved peak canning of Tomato.