Do you have the press release in question? I'd be very curious to see it. All I found at a glance was Truman's well-known one (https://www.atomicarchive.com/resources/documents/hiroshima-...) which was followed by the Secretary of War's (https://www.ibiblio.org/pha/policy/1945/450806b.html) and neither seem to mention anything about enrichment methods or even the concept of isotope separation.