This may just be me sounding like a broken record here, but if anything this page makes me more upset than the last similar page being linked on the author's website.

This person is using the IP of other, living individuals, without their permission, explicitly in order to promote his own book and consulting services, for profit. He previously did it with Command and Conquer and now he is doing it with Prince of Persia. While in the case of C&C you could say 'it's EA, who cares', Jordan Mechner is a hard working, brilliant individual who has poured his life and soul into advancing the state of the art in game design, and arguably in storytelling as well. It offends me to see his work treated with this degree of disrespect.

To be clear, I don't think there's anything wrong with messing around and trying to recreate the look and feel of the old PoP. Even if it's technically illegal, the use of the original sprites doesn't bug me. What bugs me is the shameless use of the work for personal gain without even the slightest hint of respect for the original author.

In both cases you could also easily make the argument that these are active IPs that have been used in the recent past, and that the games ported could easily be a source of profit for the original creators (or the current license holders). A Prince of Persia game and movie were released as recently as 2010, and a Command and Conquer product was released in 2012.