In the content template for one of my post types I have chosen to DISABLE the title using the DISABLE ELEMENTS section of the Theme Options in the template itself.
This USED to work - but has stopped working and now the title is displaying on the content template.
Here is a link to a sample of a page where this is happening:
From your link it looks like you are using Divi (it is helpful when creating tickets to include the debug info for us to see basic details of your site: hidden link).
I tried added the coding as shown in the thread you cited above - but nothing changed - the title (and author and date citation) are still showing up on my content template
The single.php template has been edited in the child theme and the markup no longer corresponds to the standard Divi markup which is why the workaround doesn't hide the title, and the fix to the known issue will not work on this site in any case.
You can update the CSS like so to target the title and post-meta sections as output by your child theme: