I thought it was a little weird that they start off talking about "calcium, magnesium, and iron" and then immediately switch to talking about how vitamin C degrades over time in produce. OK sure, vitamin C can enhance iron absorption, but it doesn't do that for calcium or magnesium and, being atomic elements, they assuredly do not disappear from food in storage.
When an article conflates things like this without calling it out, I become suspicious of the rest of the claims.
When an article conflates things like this without calling it out, I become suspicious of the rest of the claims.