Did he plead guilty? Would that give him a lesser punishment?
He did plead guilty. However the prosecution had clear evidence that he was guilty that he possessed these images. It wasn't a balance of probability or a he said, they said, blah blah.
A guilty plea in cases does give the judge cause to reduce a sentence. In this case it sends absolutely no message to these abusers that they will have a harsh sentence or indeed a custodial one.