For starters:

Scale 1:500 means the volume of the model is 1/500^3 = 1/125,000,000 that of original.

The original had a mass of roundabout 300,000,000 kg, so model mass should be 300,000,000/125,000,000 kg = 2.4 kg.

At 0:16, we learn it is 11.4 kg. Too massive by a factor of almost 5.

Kinetic energy of model at 0.03 kg, 90.5 m/s (values at 1:07 min) is 123 J.

Kinetic energy of original Flight AA11 at 120,660 kg, 208 m/s was 260,000,000 J - Factor of 2 million = 500 x 500 x 8.

I am not sure what it should be to be to scale - my sense is that both the impacted area / projection of that energy onto wall and the strength of the wall elements / cross-section or columns and spandrels scale with the square of scale, i.e. factor 250,000

So kinetic energy of model plane is *too low* by a factor of 8, while the structure is too massive by a factor of 5. This makes for a scaling error of factor 40.

(It is of course also wrong to model the floors as metal plates, which will behave a lot different from light-weight concrete slabs with relatively flimsy open web trusses. And gravity should also be scaled and probably be 500x higher. Plus more problems)