Hi There @LiberalJudaism
For now, you can hide your post dates by adding the following CSS rule into your X -> Theme Options -> CSS area.
I see that you have child theme activated on your site, first you can disable your child theme temporarily by activating your parent X theme under Appearance -> Themes, to see whether your child theme customizations are causing this issue.
If you’re still having this issue, then you can deactivate your 3rd party plugins except Cornerstone plugin, to see whether you’re experiencing a plugin conflict. If the issue resolved, then you can activate your plugins one by one to see which plugin causing the issue.
Please make sure to clear all caches when testing your issue (https://www.wpbeginner.com/beginners-guide/how-to-clear-your-cache-in-wordpress/).
If you’re still having issues, please provide us with your WordPress login credentials in a secure note to check your issue further.