You may be able to delete the comments from confluence using a delete command in the database, however as far as I know there's no bundled functionality to do this. I could find this feature request, but wasn't implemented yet: https://jira.atlassian.com/browse/CONF-5023
I suggest to try to remove the comments from a page using this Delete SQL command:
delete from content where contenttype = 'COMMENT' and pageid = <page_id>;
Always backup the database before running any SQL alteration or removal command.
Find the page ID above from the page of confluence you want to remove the comments from just by editing the page and looking into the URL. It should have a pageid there.
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