I _think_ what they mean is that the `accept` will end that specific hook, but another may stop it. For example, looking at this illustration, if the **Forward Hook** were to `accept`, but then the **Postrouting Hook** were to `drop`, that would satisfy your latter quote because it is "another hook."
(This is speculation because I only have experience in `ipchains/iptables` but it looks similar enough and IIRC worked in a similar manner.)