No, that PR only allows Filesystem plugin to request the read/write permissions, but even if the user accepts the permissions, the external storage is still not accesible on Android 10 if the app is built with SDK 29.
It can work if you previously installed the same app in the same device but compiled with SDK 28, then when you build with SDK 29 will still work, but if you delete the app and you build with SDK 29 and install, it won’t work.
You can also add android:requestLegacyExternalStorage="true" to the application tag of the AndroidManifest.xml, that will make the external storage work as if it was built with SDK 28.