Iran imports radiopharmaceuticals from Canada and that import was never restricted. Besides, radiopharmaceuticals are done with cyclotrons and do not require 60% HEU.

There are dozens of elements and isotopes used in radiopharmacology. Highly enriched uranium is absolutely one of them -hence why energy.gov is posting about it- and it's significantly cheaper than using a particle accelerator to create radioactive isotopes.

HEU is not directly used in radiopharmacology for obvious reasons, the energy.gov posting is about a non-fissile isotope of Uranium and not HEU.

It's much cheaper to use a cyclotron than get massively sanctioned - unless you what you really want is a weapon.