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This article could use an awful lot more links to the cited research. Reading this as a skeptic, I don't know whether the claims are accurate or not, but the fact that (nearly) none of his claims are supported by citations to authoritative sources is not promising.

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Literally the author states it's unverifiable data:

The chart has unverified information "The average mineral content of calcium, magnesium, and iron in cabbage, lettuce, tomatoes, and spinach has dropped 80-90% between 1914 and 2018 30,34,35,36,371. Asterisks indicate numbers could not be independently verified."

If you reduce the amount of magnesium in a plant by 80%, it dies.

It could possibly vary in fruits, so the tomatoes get a pass. But leaves need a pretty constant amount.

Just a guess, but could this be caused by the longer and longer supply chains over the past century?

what if the plant is long dead?

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