I rolled this weakness as Daniela Reyes and my deck was pretty much unable to handle this guy save for committing Vicious Blows with my Survival Knife or waiting for enemy phase. I think it's a mistake that the dealt damage reduction isn't reduced to a minimum of 1 - I had to versatile into some tactics into the deck to be able to deal with this guy.
Double unfortunate for me is that I have this weakness in a campaign with Mark Harrigan who also randomly rolled into this weakness as well, which has led to rather amusing moments of killing each other's Lurker in the Darks when they spawn on top of the other investigator.
Bonus points for this enemy not doing horror though - we love having sanity.