Per my test, we cannot crawl only one subsite and exclude the entire site collection.
Even though the crawl rules look fine, when a full crawl is run, the site collection(include the subsite) will not be crawled.
As a workaroud, we suggest you create a new result resource to limit the search scope to subsite only via
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I am ok with using result resources, whatever get's the job done.
Could you provide instructions on how to configure a result resource so that search results only contain results from a certain subsite?
And also possibly, depending on what will be our final solution, how to limit search results to only pages from one certain library.