One cannot claim to have reached a definitive conclusion in a comparison of two things unless they have all the facts on both of them. The fact is that comparatively few complications of neonatal circumcision are reported, and many are painstakingly attributed to other factors (bleeding due to clotting issues, adhesions due to poor post-op care, etc.). Many of the complications of neonatal circumcision don't become obvious until the child has reached sexual maturity, at which point the victims are too embarrassed to admit the problem and/or simply don't attribute it to having had a piece of their pennies sliced off as an infant. Combine that with the vilification of the foreskin, and shaming of men who speak out against the assault on their bodies, and you are not going to get reliable results. I suspect the authors of this "study" knew that.
from the article: Circumcision study: If you’re gonna snip, do it early