As I know this is not possible OOTB. From current options only using a plugin is a way to do it. You can write your own or use one of the existing on Marketplace for example Community Forms that allows locking comments on specific pages - https://marketplace.atlassian.com/plugins/com.adaptavist.confluence.forums
I hope that will help.
You need to add this script in a html macro on a page where , you want to hide comments.
Can you try this script.
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