A noindex rule can come from two places: a robots meta tag in the page's head, or an X-Robots-Tag header sent with the response. The header is the only way to noindex a PDF or an image. Both can name one crawler, such as googlebot, or all of them.
The check reports a rule as applying to Google when it names all crawlers or googlebot. A rule that names only another crawler is listed but does not count as a block for Google.