I don't know what post from 2014 you are referring to, so I have no chance of finding it.
I thought @BeckyEbook gave you the solution to hide chapter titles. You don't need to hide it behind an image, it just remains invisible. The title="" makes the chapter number available to the TOC generator, but the empty value between the opening and closing h2 tags means nothing is displayed.
<h2 title="Chapter 1"></h2>
FWIW, when I come across a book with missing chapter numbers I add them using...
Find: <body>
Replace: <body>\n\n <h2>mm</h2>
The above adds the header tags. Of course you need to be careful that you select the correct xhtml pages.
Next I run a Regex-Function (in Calibre) to replace the mm with incrementing numbers.
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