XcodeBuildToolPlugin not available in XcodeProjectPlugin

For WWDC22 session "Meet Swift Package plugins " the following code snipped is shared in Apple's Developer application:

In Xcode 14 Beta 1 I receive the compilation error Cannot find type 'XcodeBuildToolPlugin' in scope

Is the given example valid and is a struct/type missing in the new library module XcodeProjectPlugin ? Or needs the example code to be adjusted (further then I bug I mentioned below in the comments)?

import PackagePlugin

@main
struct MyPlugin: BuildToolPlugin {?
    /// This entry point is called when operating on a Swift package.
    func createBuildCommands(context: PluginContext, target: Target) throws -> [Command]
        debugPrint(context)
        // BUG: needs to return an array !!!!!!!!!!!!!!!!!!!!!!
    }
}

#if canImport(XcodeProjectPlugin)
import XcodeProjectPlugin

extension MyPlugin: XcodeBuildToolPlugin {

    /// This entry point is called when operating on an Xcode project.
    func createBuildCommands(context: XcodePluginContext, target: XcodeTarget) throws -> [Command]
        debugPrint(context)
        return []
    }
}
#endif