Getting rid of strongarm in features export
the short answer is yes you can delete it since you don't have any strongarm stored in this feature.

usually features add 3 pieces of code to any exported type:


the configuration it self in a file feature_name.features.config_group.inc or feature_name.config_group.inc
the include part in features feature_name.features.inc
what are the content of the export in feature_name.info


you can delete those manually and the feature will act as if they where never there, though removing a complete set of config group (e.g: remove all strongarm config) form the features UI will usually leave you with config file .config_group.inc (1), and rarely with include settings in .features.inc, which you can delete them manually.