Actually what he meant is that the VLAN segments are connected to the T0 uplink interfaces but the Network Topology does not show it that way (it shows the segments as not connected to anything - the "X" marked on the picture).
I've delivered this class a few times now and it happened every single time.
One of my students pointed out that it's the same on his production environment so I'm assuming this is a bug or something very poorly explained.