Hello Daniel
The output of the show ospfv3 database will not show the actual prefixes being advertised by each LSA. Only the router IDs will appear as shown in the lesson. However, you can use the show ospfv3 database prefix to be shown the LSAs for each specific prefix. There, you will see the IP addresses of the prefixes advertised.
Now it’s also interesting to note that since loopbacks have been created on the routers, you should see those loopbacks being used as the router IDs of the OSPF routers. However, because OSPF was already running when the loopbacks were created, the OSPF process retains the IP addresses of the interfaces as the router IDs. The only way to change this is to clear the OSPF process on both devices.
I hope this has been helpful!
Laz