What ? How can redux be replaced by graphql ? How would you handle multi form pages where you have to maintain state ?
I guess one of the point the author was trying to make is that using GraphQL makes it easier to handle the state on the server, and it has multiple advantages (what if you fill a form half-way through on your desktop and want to resume on another device).
GraphQL also makes Http requests "cheaper", you only ask for what you need and reduce payloads in general.
I planned on using both at first when I started migrating to graphql, but quickly saw that indeed redux was becoming redundant when we use apollo. Especially since they added local state management [1].
[1]: https://www.apollographql.com/docs/react/essentials/local-st...