The peer-reviews carried out by the ‘scientists’ at CRU and the IPCC were used as a way of pushing through agenda-driven science and driving actual science to the curb.
No matter how it ought to work, the peer-review process became corrupted when people like Jones, Briffa and Mann were reviewing each others papers and preventing others from getting published. The author seems to understand this.
Peer review is supposed to uncover errors prior to publication, improve clarity and readability and filter out wild speculation, surmise and ranting. CRU and the gang apparently perverted it to prevent criticism or presentation of alternate hypothesis.