I think they legitimately did not know. The person who worked on it directly, Jerry Solinas, did not remember and gave an explanation that turned out to be wrong. In his defense, multiple people told the same story about hashing a phrase that was wrong.
If they did know, they could have handed over these timestamps 15 years ago and put the issue to bed.
After Dual_EC_DRBG, there is no longer justification for any attitude towards the NSA other than suspicion and skepticism. Everything should be assumed a potential attack vector and thoroughly explored. I thank the community for carrying this torch for so many years.