To some extent I guess. But arguably even dating back to the Project Blue Book[1] days, the USG has always conceded that some small portion of "UFO" events were actually inexplicable. Sure, they maintained that
most UFO incidents had prosaic explanations, but I don't think they ever argued that it was "all".
Compared to the conclusions from PBB:
The Air Force supplies the following summary of its
investigations:
1. No UFO reported, investigated, and evaluated by the
Air Force was ever an indication of threat to our
national security;
2. There was no evidence submitted to or discovered by
the Air Force that sightings categorized as
"unidentified" represented technological developments
or principles beyond the range of modern scientific
knowledge; and
3. There was no evidence indicating that sightings
categorized as "unidentified" were extraterrestrial
vehicles.
It seems like the biggest change in the messaging may be around (2). And I guess that's something...
[1]: https://en.wikipedia.org/wiki/Project_Blue_Book