Ah, so that section is simply "history," not that they're installed. "Instant Plays you've played or viewed in the last 30 days will appear here"; they'll go away on their own.
Under "installed games," yours is empty. Meaning they're not installed on your device/"on your device", nor using space. It's just a case of viewing what's been used and has now clearly been uninstalled.
If you dont wish to use game hub, nor want to risk games being installed, you can uninstall the app itself