Except the book isn't available on his website. His website has link to a warez site with his book on it. So whatever deal he has with Springer it doesn't seem to allow him to host the book on his site.
He does host a simplified version of the book however, 'EZ version' as he calls it. I'm sure the 'steal this' full version comment is just tongue in cheek and/or sarcastic. Perhaps even a veiled prompt at Springer to send their lawyers after LibGen, who knows, perhaps it hasn't happened as fast as he wished for, thus the comment. Or maybe it just saves him some bandwidth if people get it somewhere else :) So many possibilities.
