Someone correct me if I’m wrong, but I believe the referrer (Referer) information is just the URL, and most browsers would only send the hostname if it’s a link to an external site.
So the analytics software would only have access to the domain like “lemmy.world”. It wouldn’t be cohesive, as in unless the analytics provider had done a lot of work to support lemmy, it’s not going to group all the different lemmy sites into one category. You’ll see Beehaw.org and Lemmy.world as separate entries.
My guess is no one has visited from Lemmy. People don’t tend to share links to company websites on Lemmy.