The 'Diaries' are over 3 years old at this point; and the demand has tailed off considerably.
On the Usenet group Rec.Audio.Pro it was discussed ad naseum who the band and producer (s) were. Mixerman himself used to post there and was
quite the celebrity incognito for a while. As it turned out most of the 'regulars' knew him and his work quite well.
A whole lot of Band theories were pushed...I even thought I had found out the band ( I thought it was Guns and Roses ) but was informed by a guy at Mercenary how wrong I was--although it's thought that Mixerman worked on the first GNR album in some engineering capacity.
But truth be told it was all a fictional account that was a conglomerate 'mix' of his many expieriences. Oneonly has to be in the business...especially in the upper echelons of engineering and producing to know that no one who wants a job in the future (especially a freelance engineer/work for hire type) is going to say anything specific in public about the shennagans that go on when recording. It's too small a community to talk in ( even if you do generate $200K in sales MM was reported to have earned from his 'diary').
And another aspect of the 'diary' is that it plays into the stereotypical thinking that rock musicans are really idiots controlled by some Machavellian super genius musican producer. Those people only account for less than 10% of the musicians...