What specifically are you referring to?
The original `createClass` API was indeed deprecated and removed all the way back in 2017 [0]. You can still use them today with the separated `create-react-class` package.
ES6 class components still work as-is even in React 19 - it's just the legacy context feature that's been removed. They're generally discouraged, in that function components are now the standard way to use React, but they're still not "deprecated" in the sense of a warning or removal.
[0] https://legacy.reactjs.org/blog/2017/09/26/react-v16.0.html#...
