en.wikipedia.org/wiki/Chelation

Authoritative ophthalmology sources describe hypercalcemia as a cause/risk factor for band keratopathy, not a consequence of it. The American Academy of Ophthalmology's EyeWiki lists "systemic hypercalcemia" among the causes of calcific band keratopathy, and Cleveland Clinic likewise states that "Hypercalcemia can cause band keratopathy."

Those same sources describe EDTA chelation as the treatment for the corneal calcium deposits themselves. EyeWiki explains that the deposits are scraped and then treated with EDTA-soaked material to remove the calcium from the cornea. Cleveland Clinic similarly says providers remove calcium deposits in the eye by applying EDTA.

So the article's sentence is backwards on both points: band keratopathy does not "often result" in hypercalcemia, and EDTA here is not being used to treat hypercalcemia. It is being used locally to chelate and remove corneal calcium deposits in patients who may have band keratopathy.

In immuno-PET/SPECT chemistry, bifunctional chelators are used for radiometals, not for radiohalogens in general.

A review in Cancers states that PET/SPECT radiometals such as 89Zr and 111In require a bifunctional chelating group, whereas nonmetallic radionuclides such as iodine can be labeled directly on the antibody or via prosthetic groups. A second review in J. Labelled Compounds and Radiopharmaceuticals states the same principle even more explicitly: radiometals—unlike radiohalogens—require a chelator for stable sequestration in vivo.

That means the sentence is inaccurate in the way it lists elements. Zirconium, gallium, copper, and yttrium fit the bifunctional-chelator framework. Fluorine, bromine, and iodine do not generally enter antibody PET imaging as 'bifunctional chelate complexes'; they are radiohalogens and are usually introduced by direct radiohalogenation or prosthetic-group chemistry instead.

The problem is the phrase "for any use". FDA/NLM labeling records show that edetate disodium (Endrate) was FDA-approved as a prescription drug for the emergency treatment of hypercalcemia and for ventricular arrhythmias associated with digitalis toxicity. Separately, FDA's current food-substances inventory lists disodium edetate / edetate disodium under multiple food additive and related regulations.

So while it is true that disodium EDTA is not FDA-approved for heavy-metal chelation uses such as lead poisoning, the blanket statement that it is "not approved by the FDA for any use" is factually incorrect. A more accurate statement would need to limit the claim to the specific use being discussed.