They are not wrong, they are simply avoiding a direct "yes" or "no" answer here.So C's are wrong about the helicopter carving then?
Because, if i was to be nitpicky, they did not confirm helicopters or airplanes existing in the past. All they said is there was a technologically advanced civilization in the past.
You lot should stop attaching "technology" and "civilization" to the way our civilization today looks and works. I can see it on forums, i can see it in fiction, i can see it in science, and i can see it in everyday life. When people see the term "technologically advanced civilization" they immediately think cars, airplanes, spaceships, rockets, television, etc. Not only people assume a linear progression of technology, they also assume that every civilization MUST follow the same kind of progress that we did.
And the most prominent of that is the assumption that an "advanced civilization" MUST have access to nukes. We found out how nuclear fission works, therefore, everyone with space-faring capabilities must too.
Then comes the 4D tech, and every assumption is shattered. Is it really any wonder that our scientists cannot understand how those things works, when they still keep looking at it from the linear materialistic point of view? How can such a narrow-minded approach understand something that goes into infinity? Technology is not just one direction, it can go in all directions, even at once.
In the end, what does "advanced civilization" even mean? Is a civilization that has cars but cannot travel to Mars really that advanced? Or would we view as advanced people that still carve rocks barefooted, but those rocks open portals to different planets?
And if you are able to make a rock vibrate and store energy of a nuke, do you really need to know how to build a nuke yourself? Do you really need to understand how that technology works, when you can nullify it with a snap of a finger anyway?
Finally, there is still one last thing that people are missing here: those carvings can be real, and people did actually see helicopters and airplanes, but that does not mean they existed at that time. Because, just as like modern times have people that could see visions of the future (Julius Verne comes to mind), people in the ancient times should have been able to do that too (and perhaps to a much higher degree than we can today).
Who knows, maybe they did have airplanes. But they didn't need to have them. Airplanes (or nukes ) are not a requirement for a "technologically advanced civilization".