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This is restating the same thing; prefer the original personally but don’t think it would hurt to spell out the effect of low Ca/Vit D, and high PO4 by adding this to a second bullet
Low Ca/Vit D is what causes continuous stimulation of those receptors and consequent downregulation afaik
https://next.amboss.com/us/article/Hg0K92?q=parathyroid+hormone#Z82b80df8e4df1330c0aa8506a5aa4525
I just didn’t like the previous explanation because it makes it sound like tertiary hyperparathyroidism presents with low calcium, but it presents with high calcium