They are US expiremental aircraft. They now have a cover story to explain their presence when not expected. If this were tech that our military didn’t know about shit would be hitting the fan right now and we would know something really threatens us.
If we have equipment like this for real, then there may be other worldly intelligences, if they truly exist, and are monitoring, starting to get worried.
In other words, if aliens weren’t visiting us too often before (because we were like ants and not likely to get beyond the moon,) they will be visiting us now. Having that type of tech means that we could leap into space to a very substantial degree and go knocking on their doors. I don’t think they would like that very much....