This is a new site so no custom CSS has been created at all. The privacy page has been created and the link appears as it should in the footer. Like the original poster’s query, in the comments section of the post, there is the comment field, name, email and web site fields but there is no checkbox. From another site: “With WordPress 4.9.6, the default WordPress comment form will now show a comment privacy opt-in checkbox. All WordPress themes that use the default WordPress comment form will now automatically show this checkbox.”
Does Weaver not use the default WP comment form?