No, it isn't.

Unidentified is a lack of identification, not a type of identification.

Null != 0.

Say I went out into the woods, found a patch of mushrooms.

I know some mushrooms are edible. That doesn't mean the random fungi I found is.

So it's a mushroom (Flying object corollary) but I can't tell what type it is (unidentified) and thus eating it is probably a bad idea.

Could an expert identify it? Probably.

And if you pull in a lot of resources, that flying object probably could be identified.

That doesn't mean Bubba on a trip to the outhouse after too much moonshine can identify it, thus from his perspective it is absolutely a UFO.

Just because something CAN be identified, does not mean it was identified.

But I'm just arguing semantics to kill some time until my shift ends.