Hello Dawit
By using the show dmvpn command on the spoke routers, you can see that there are indeed two peers. Both hub routers are registered. You can also check routing in the spokes and see that there are indeed two equal cost routes via both hubs. You can even shut down the interface of Hub1 and check both the DMVPN peering as well as the routing and verify that hub 2 is indeed showing up in both routes and peers.
Note here that both hubs appear as equals, that is, that both are used simultaneously, as they are considered equal cost paths. If you want to choose one over the other, as the lesson states, it can be a bit more challenging.
I hope this has been helpful!
Laz