mt_rand function for temp user_id

Hello.
This piece of code in public/class-heateor-social-login-public.php.
The way i see it this can generate a unique id which might exists for another user.
Am i right?

                    // generate unique ID
                    $unique_id = mt_rand();
                    // save oauth token and secret in db temporarily
                    update_user_meta( $unique_id, 'heateorsl_twitter_oauthtoken', $request_token['oauth_token'] );
                    update_user_meta( $unique_id, 'heateorsl_twitter_oauthtokensecret', $request_token['oauth_token_secret'] );