I think WordFence is a backend plugin. So please make sure this line will be shown to non-logged in users (regular visitors) first.
HMWP can not scan plugins source code and change those lines automatically. It’s almost impossible!
Although, you can easily remove it by Replace in HTML feature, this will stop that function.
If it’s really important for you I suggest to change it with Replace in HTML feature (e.g. wordfence_logHuman=wf_logHuman) and then manually search WordFence source codes and replace wordfence_logHuman with wf_logHuman .