If Cooper witnessed actual anti-gravity vehicles, he wouldn't be wrong to draw an alien connection. I see him recanting what he said as more of an edit.
There had been much talk about a strategy for disclosure the last few years. The strategy turns away from the hard Redpill and instead would focus on first deciminating information about ancient advanced civilizations that would allow for an explanation of skunkworks tech without having to go deep into whether or not there is current contact with ET types.
Instead, we get a public admission of all the "forbidden archeology" and how reverse engineering has allowed for Yuge leaps in our heretofore unacknowleged military hardware.
Usually manage to stay out of these over 40,000 ft discussions that supersede our mandated scope, but it being a big interest of mine, couldn't help but chime in this time.