I have tried to get my head around the concept of TMLE, but most references seem to be written by people who despise being understood (or maybe I am just hebetudinous). I have tried to read the paper
Targeted Maximum Likelihood Estimation: A Gentle Introduction
which is not as gentle as the title implies, in my opinion. Is there a reference that explains this approach at a, say university/Masters level? Or is the concept of TMLE much more complex that cannot be explained at this level?