Replace "true/false" with "probably/reasonable to consider" and you're doing exactly that. You're using uncertainty to elevate an implausible hypothesis for consideration.
The comment I replied to was stating that if alien vehicles visited Earth then the military would be aware of it, with the implicit assumption that if the military was aware of UAPs then the it would inform the public.
My counterargument is that if the military detected UAPs then they would have both a strong incentive not to inform the public and the means to keep it secret. Thus the (public) absence of (military) evidence is not evidence of absence.
