IPCC still out of the building

A month has passed since the “Gang of Four” sent their letter to the IPCC demanding they reverse their view on global warming. Piers Corbyn, one of the four, said on May 11th: “We have as yet received no response from the IPCC which is astounding since the matter is of such great importance. I do not believe they can give an adequate response.”

Why am I not suprised?