part of content on plugin seems outdated on https://premium.wpmudev.org/project/google-analytics-for-wordpress-mu-sitewide-and-single-blog-solution.
links to 'Supporter' framework is correctly redirecting to prosites but this text may create confusion to new users as supporter plugin is renamed to Pro sites. content is quoted below.
And if that's not enough to make you go 'Callooh! Callay!' - well, we've also integrated this into our 'Supporter' framework - so you can restrict access to the individual stats to paying users only (if you wish). Just visit Site Admin > Supporter once it's installed to set it to free / paid.