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if a random broadcaster like nilered can do it, I don't see any technical reason that competent iranian scientists (or scientists hired by iran) couldn't. Other issues, like saboteurs working for mossad, might be a problem.

They might also be able to float u238 on top of u235 through neutron-induced anisotropy, vis-a-vis melting it on top of a high-emission plate, sort of like how vapor deposition works, but in reverse, owing to the cross sectional differences between the base element and the isotope. Heat, separate, and then quench. Scrape the contents, repeat until the uranium is depleted.
Then repeat that step with the uranium collected, until enriched. Haven't seen this method used but theres actually no reason it shouldn't, but thats just hypothesizing without any data on what the yield of the process might be.

Melting down non-enriched uranium bars might also be possible, where sound waves of specific frequencies could be used to induce separation between the elements in a recursive refinement process, not unlike how sound is used on top of a membrane to induce patterns in non-newtonian fluids, i.e. oobleck, (this time due to anisoptries introduced by, again, cross-sectional differences between uranium and its isotopes). Would definitely take tuning of the process to get right.

There is no practical reason a state level actor couldn't enrich uranium if they really wanted to.