Monitor Backlinks is a completely different thing than Google Analytics. 

We provide info on backlinks to your site, along with keyword ranking. 

Aside from GA, we use other data sources like Majestic, Moz, along with our own crawlers. We check the link status and let you filter them. This is just the tip of the iceberg.

A few other things worth mentioning:
 - Monitor Backlinks lets you add/get data on competitors, which of course is not in GA
 - GA doesn't show you all backlinks (not even in Google Search Console)
 - there is no way to measure them or monitor them in GA.
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