Yes but I believe they are not just saying this because the object is unidentified etc. They are making a judgement in relation to their and our current understanding about the way ordinary observable things work. What then are they and we to think when a story is given that a pyramid shaped object the size of a small house was seen levitating between trees dripping molten metal with a few humanoid type beings floating around it?
(1) Ordinary Joe Bloggs thinks he has gone either insane or he is hallucinating- but there are other witnesses?
(2) It is a complete lie.
(3) It is true.
If you don't believe there has been a single recorded observation of these things shattering our understanding of physics then you haven't looked hard enough imo.
So you're saying that someone has measured verifiable data that would be needed to know that the craft broke our current laws of physics? I think you've been looking too hard!
Also secret option 4) it was a hoax, I've seen several magicians perform acts that appear to defy scientific knowledge but that doesn't mean that i'm jumping around telling everyone that it's totally possible to cut someone in half without harming them.