I have never had Spider Mites on my tomato plants, but I have had Tomato Russet Mites, and I know it's not those. I don't see any webs or tiny dots of black/red. I think a nutritional deficiency would present uniformly, across for instance, all lower older leaves, or chlorosis on the whole leaf affected, especially at this advanced stage. A toxicity certainly can present like this at least at first, but it will soon be a whole plant thing if it is a toxicity.
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