Looking at the now-unclassified report, it appears that the results were disclosed, though, in a way that seems generally consistent with the article. Page 8 of the linked PDF (the report of this experiment, heavily redacted for public release, even now; note that it was edited by Frank) says that the outcome of the experiment was disclosed to the designers:
https://nsarchive2.gwu.edu/news/20030701/nth-country.pdf