Hi there,
I want to use the SiteReviews plugin only for the post in the reviews category of my blog.
This is something you will need to ask their support.
And don’t want to allow users to comment on the reviews posts, instead, they can leave a review.
But don’t want to hide the old comments which posts already have.
I believe you just need to close the comments for those posts.
And also want to remove the Comments count from the page header and want to show the total no. of reviews instead of that
You will need to check with their support to see how to output in the review counts, ideally a shortcode format.