There is no comment listed in your page source, so the code is not inserted into the correct TPL file of your template.
Your theme is theme_ecolife. It is quite possible that it has some kind of product page layout pre-set.
I assume it will be somewhere like ./themes/theme_ecolife/templates/catalog/product_layouts/ and your chosen template or
./themes/theme_ecolife/templates/catalog/_partials/product-cover-thumbnails.tpl.
Here you see a comment in my code that should appear in your TPL template.