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The goal is to make it easy for researchers studying how Zosimas was used in the creation of Sinaiticus c. 1840 to get quickly to a particular page or section. By comparing things like
general agreement
homoeoteleutons in Sinaiticus
unusual representations like Adonai-JHVH and JHVH-Elohim,
Psalm 14 (with the Romans 3 section)
spacing
names, titles
unusual spelling
corrections in Sinaiticus
and especially the "variants" in the back of Zosimas that seem to indicate where it diverges from Alexandrinus (and/or Grabe) with a reading that will likely be Vaticanus.
So while our techie Kirk likes to work directly with the Zosimas PDF, we can see how the URL directly to a chapter or page can be of great assistance so others who are looking at this connection.