Yes, the snippets are quite often referring to old versions of the theme (presscustomizr.com/code-snippets).
E.g. for https://presscustomizr.com/snippet/display-categorytag-description-different-place-customizr-pro-theme/ the description below the code doesn’t fit the code example (talking about before and after loop, priorities, etc.)
Also it only seems to work if the priority and number of arguments of the add_filter() is provided correctly – e.g. add_filter(”, ”, 20, 2). I was struggling with that quite a lot until I found out.
Just as a side remark – having a website without https nowadays (one can get encryption for free via let’s encrypt) is a bit anachronistic.