To answer OP direct, UFOs are real, as in, there are real sitings of objects flying that people have not been able to identify, per >>833315
This is not to say conclusively they're of an extraterrestrial origin, however.
The fact that they are real, but not necessarily of an extra terrestrial origin, therefore has no implication on the truth of the gospel.
If they are of extraterrestrial origin, however, and from the same plane of existence as us (as in, they're not demons or other spiritual beings) I would be inclined to think that this would have enormous implications, or at least throw up serious questions, about the gospel:
Presumably they would have fallen like we did and therefore be required to be subject to a plan of redemption - presumably the incarnation, passion and the cross that occured here on Earth 2000 years ago would not apply to them given God incarnated as a man, and not as one of these alien beings. Even if these Alien beings were merely extra terrestrial humans, the bible and the redemptive history therein only ever refers to our world as the efficacious setting, so they would not be subject to the power of the cross here.
I saw the articles re: the video clips you linked a few days ago, and I am of the opinion that their release represents what the kooks (no disrespect meant) on yt refer to as 'predictive programming,' i.e. casually giving small and minor tidbits of information to disseminate publically to get the masses used to and subconciously anticipate a particular idea or concept that will be introduced at a later time to effect substantial and radical change at some point in the future.
The idea or concept or event that will be introduced that these released clips form a part of the building up to is what is known as 'disclosure' - the disclosure of a first full blown public revelation of extra terrestrial 'life' who will come in peace to tell us they're our creators - yes, all that ancient aliens/prometheus bs.
Think about it - is not the official release of these tapes absolutely huge, and very strange, and yet has gone pretty quietly under the radar? I don't hang out in the kookier parts of the internet much or watch too much yt nonsense so many might have been frothing at the mouth over this but missed it, but to me it seems an extremely strange occurance for the US military to release these clips, and then secondly for no one to seemingly care about it much.
I guess everyone is too distracted with covid or maybe everyone is just disinterested and apathetic in general these days? Nonetheless, the quietness of what I perceive to be such a hugely strange thing is telling of a 'predictive programming' element. Note: I'm not necessarily saying it is the US military or any other earthly actor conspiring to building up to disclosure with drip feeding these clips: they may be conspiring from the inside and have access to and control of knowledge and secrets that we don't and they're consciously enacting a plan to use that knowledge and those secrets including with predictive programming with a view to building up to disclosure or on the other hand they may literally be as clueless as the rest of us and released them in genuine ignorance and seeking to provide honest clarity over what they have captured on film and what limited information they know about the UFO. But with everything there is always a spiritual dimension and actors behind everything so there is no question at the very least this stuff will be being orchestrated behind the scenes by the principalities, the powers, the rulers of the darkness of this world that Paul mentions.
Which brings me to the next and most important point: If these UFOs are extra terrestrial, you can bet they're not natural but rather supernatural, specially full blown demonic entities, as other anons have alluded to in their answers already in this thread. Again I don't watch too much kooky youtube, but if we're approaching some of the key aspects of the end times, then I've seen a few grass roots home stew films made by Christians that make a very convincing case for how future events may unfold in the future given the current trajectory, including AI, transhumanism, the beast system, the New Age/gnostic/kabala/eastern heresies and demonic interjection and yes, a massive, formal 'disclosure to the entire planet of our 'ancestors' (demons posing as our alien creators) with the view to creating a NWO. All of the films are at least a couple of hours long and are a bit shoddy but very much worth a watch, I can get the links if you're interestested.