This can easily be done using some liquid condition on price if you are familiar with coding rather than just follow the instruction otherwise reach me out I will help you
Solution :
Go to code edit and search for the price snippet than their will be a price div above that div just past that if condition
{% if product.tags contains 'hide-price' %}
{% endif %}
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getting much closer. It is doing the opposite. It is showing the price for products with the “hide-price” tag and not showing the product pricing that don’t have the tag.