Open the File and find the name of the bookmark you want to goto, and put that on the end of the url instead of page.

If your using Chrome, bookmarks are in the "Document Outline" section, and Adobe just has a bookmarks section. Other browsers etc will vary.

    https://www.revisor.mn.gov/rules/pdf/2105/2020-03-06%2012:37:19+00:00#Part%202105.0215

The Bookmark for the section your looking for is "Part 202105.0215"

Links don't like spaces, so it becomes "Part%20202105.0215" (the %20 is just a url encoded space).