JNCIE-SP/VPNs/Layer 3 VPNs/6PE

On my journey to the JNCIE-SP and the water is already getting rough. I have been working through the following example in an effort to learn 6PE:

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/l3-vpns-ipv6-traffic.html#id-example-tunneling-layer-3-vpn-ipv6-islands-over-an-ipv4-core-using-ibgp-and-independent

But not only do the pings in the example above not work, this topic is actually 6VPE and not 6PE. I wish the official Juniper tech docs would use the same nomenclature as the exam curriculum.

Ideally I would skip this example and just move on to 6PE since 6VPE is not listed anywhere on the curriculum, but I'm too curious to let it go. Does anybody know why the example above does not allow for successful pings due to a "no route to host" message on CE1?

I notice on PE1 that ::/24 is learned via two interfaces. One connecting to CE1, and the other connecting to the P router. However, only the route via CE1 is active.