Every description ever given under oath is “non human intelligence blah blah”. That equally applies to aircraft made by AI.
The militaries are usually ahead of the public so it’s not hard to believe they could have advanced aircraft designed by AI.
Discussion
AI designed craft in the 50’s and ‘60s. 😏 and the 30s. And the 1700s.
To be fair we did have an alien working for the US back in the1950s: John von Neumann.