Is Wikipedia a good enough source for you, because I linked to that too, as long as you wish to posit I am "provably wrong". Aside from solving it, the NSA, who like anyone in existence can only go by the knowledge given to them in preparation (hence why it took an AI to solve the Zodiac Killer messages, as if one killer is more capable than a whole agency), did not in particular have anything to actually say about the code, which comes off as randomly assembled utterances if you go down to the "solutions" section of the page, the code explicitly having connotations with the CIA, who admitted in the very same section...

On April 19, 2006, Sanborn contacted an online community dedicated to the Kryptos puzzle to inform them that what was once the accepted solution to passage 2 was incorrect. Sanborn said that he made an error in the sculpture by omitting an S in the ciphertext (an X in the plaintext), and he confirmed that the last passage of the plaintext was WESTXLAYERTWO, and not WESTIDBYROWS.

The only reason I haven't given more sources is due to the temporary rule on Lemmy right now to only use sources from known sites in order to make it easier to spot spam. Had this not been an issue, I'm sure you'd be asked right about now about your, erm, sources.