Well, speaking as a completely non-representative sample (size 1) of the scientific community, I thought the evidence was fairly convincing - they looked at the

Well, speaking as a completely non-representative sample (size 1) of the scientific community, I thought the evidence was fairly convincing - they looked at the different rates as a function of when lead was removed from petrol which varied considerably at the country level. However I did also flag that they hadn't considered video gaming as an alternative possibility (but that's just a private hypothesis of mine). Certainly not fringe science though.