Yeah.
When you think that a water balloon = a 767 jet wing, yeah you're over simplifying.
Go read the paper that's been linked for you and come back with your refutation. If you can that is.
Okay,
So your example of course is what the crash test will mimic with a real wing and some real columns, to try to recreate this gash that they say was caused by a basically hollow aluminum wing filled with fuel:
First a reminder the wing is basically hollow, even in their model:
They're made of folded sheet metal, precision machined to accept more sheet aluminum for the skin. That's basically it. The added fuel may give the wing mass, but this is what's holding it together. Not a full metal jacket - sheet aluminum, none of which was even close to the thickness of the steel in the twins.
Now, they
did model the shape of the columns properly at least at one point:
And I do see where they considered the angle of the wing's impact relative the tower face, but I don't see where their exterior walls included columns with two sharp edges each. Is there more detail you can point to where they calculated that interaction, or did they do what everyone else has done when it comes to modeling the impact by modeling the columns as square boxes without sharp leading edges? Did they do as MIT has done and calculate the wings by rolling up all the aluminum in the wing and reforming it as an aluminum machete?
I'd like to see those figures please.
Anyway, so they move on to fill up their model wing with fuel, and somehow this magic fuel adds density to the aluminum sheeting that embraces it like an armor coating.

It's not of course, but in NIST land, wings filled with fuel are better than dense metal penetrating warheads. Where a bullet usually needs an armor coating to be able to maintain it's integrity long enough to penetrate steel, and where a water jet needs a tiny jeweled apperature to maintain a coherent column of water long enough for the mass and velocity of the water to overcome the steel, WHAT pray tell, WHAT is maintaining the integrity of the wing long enough for it to transfer it's energy to the columns, as it struck them sequentially, one sharp steel knife edge at a time?
Remember what's under the aluminum sheeting of the wing.
If a bird can do this...
Why would a wing constructed out of aluminum sheeting...
...be able to stay together long enough to transfer the energy of the fuel through this:
It's spread out over a wide are and nothing was holding it together long enough for it's mass and momentum to break through. It wasn't striking at a tiny point, it was being struck by dozens of sharp edges. According to the principals of terminal ballistics regarding penetration, about which this layman has read a bit, by all accounts the wing would have shattered against the steel, and the 9/11 Crash Test will prove it.
The model should prove it first though...should be out in time for 9/11.