Note: If you have both yarn and npm installed on your machine, React Native CLI will always try to use yarn, so even if you use npx utility, only react-native executable will be installed using npm and the rest of the work will be delegated to yarn. You can force usage of npm adding --pm npm flag to the command.
You need to re-run your command with --pm npm:
npx react-native@latest init AwesomeProject --pm npm