> the US Navy/Pentagon who have found no explanation of this phenomenon thus far.
"Released no explanation to the public" != "have found no explanation". The DoD is simply not in a habit of releasing information to the public unless they're instructed to do so by the executive branch.
They did not have an explanation as of last spring when they were forced to disclose everything they knew about the phenomenon by an act of congress. There wasn't even a redacted appendix.
You're not characterizing the report correctly. The report that was released to the public is a 9 page preliminary assessment. It is almost entirely fluff. It does state that of the 144 reported cases of UAP over the course of the period of study, there were 21 reports written. Those would be the interesting reports, and precisely none of the those were released to the public, redacted or otherwise.
"Released no explanation to the public" != "have found no explanation". The DoD is simply not in a habit of releasing information to the public unless they're instructed to do so by the executive branch.