A 52-year-old woman with chronic kidney disease (eGFR 28 mL/min/1.73m²) presents with serum calcium 7.2 mg/dL, phosphate 5.8 mg/dL, and PTH 280 pg/mL. Regarding the pathophysiology of secondary hyperparathyroidism in CKD, all of the following are true EXCEPT:

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