Take a look at the arguments in the function – if you open spTopicViewDesktop and find:

sp_UsersAlsoViewing('includeAdmins=1&includeMods=1&includeMembers=1&displayToAll=1', 'is currently browsing this topic');

You can set it to includeAdmins=0, and also includeMods=0. This will hide users from seeing admins and moderators browsing the page. You can remove the function completely if you don’t want to use it, but it can be pretty useful.