No. It is not right to say that GraphQL is only for React or JavaScript Developers. GraphQL is a cross-platform, open-source, data query, and manipulation language for APIs technology, so it can be used in any scenario where an API technology is required.
On the backend, the GraphQL servers are available for multiple languages such as Java, Python, .NET, C#, PHP, R, Haskell, JavaScript, Perl, Ruby, Scala, Go, Elixir, Erlang, and Clojure, etc. So, it can be implemented with any programming language and framework to build a web server.
