Unfortunately if there is anything that uses standard Zen Cart html tags to display price on the products listing page, then that particular change will appear as unsuccessful. Perhaps the code from the provided link was referenced; however, there is nothing that says what the issue was in trying to use it and as identified here, that code only relates to the product listing not to the product itself... Note there are multiple other places where that product might be displayed along with the product price. E.g., new product, all product, featured product, specials, etc..., etc..., etc... But if it works for the site in question, great.
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