There is the matter of wind loading.
A glass and aluminum curtain wall is designed to withstand the load of wind pressing it in to the building. The connectors to the structure transfer vertical load,the weight, back to the concrete structure.
The article says one side is left open. If there is a strong wind through the building, those same connectors must carry the uniform outward force produced by the wind. That is, a good wind from the other side might just peel all that glass and aluminum off the side of the building.
The vertical shear stress in the connector fasteners is a different thing than the stress of the wind pushing outward
Good point.