You are right
The building is good and the foundation itself is fine.
Since most windows did not break, the collapse must be a soft landing (to soft soil surface) which means a slow failure.
Based on the appearances of those pile sections, the failure is not induced by lateral forces or shears.
A few issues may cause the final failure:
1. The weak soil support layer(s) under the foundation (may be partially)drags the build into dislocation
2. The dislocation produces large tensile forces and moments to break the piles in order.
The building is good and the foundation itself is fine.
Since most windows did not break, the collapse must be a soft landing (to soft soil surface) which means a slow failure.
Based on the appearances of those pile sections, the failure is not induced by lateral forces or shears.
A few issues may cause the final failure:
1. The weak soil support layer(s) under the foundation (may be partially)drags the build into dislocation
2. The dislocation produces large tensile forces and moments to break the piles in order.