> then there is the weaker threshold where these theories rule in that they should be taken as serious explanations for the alleged “advanced technology” demonstrated by UAPs
No, it doesn't really do anything to weaken the threshold.
If humans discover a method of warp travel which is then validated by peer review, this does not do anything to increase the reliability of claims made by the US Air Force concerning the existence and performance characteristics of UAPs.
The reliability of the later claims are limited by the fact that there is no independent observation and verification from non-military sources, and due to the fact that former USAF employees such as Richard Doty have claimed they were hired to fabricate and provide false information to independent UFO researchers as part of a domestic counter-intelligence operation.