I haven't seen the books and that is the first time I've seen that website but my personal opinion is that if you have to hype an industry book up that much it probably isn't worth it. Afterall you don't see ANY hype for the really good patternmaking and draping books. I wouldn't waste my money on it.
I'm not sure what books you're looking at buying but I'm sure you can find all the information, and probably more detailed, just by reading these forums and doing your own research. As far as presenting to buyers I doubt much has changed, just go to the library and find some older fashion industry book and also look at the thread in here, there was some good advice. For industry contacts the ones they are giving you you can easily get yourself from your local apparel organization. It's not like they are telling you how to contact big name designers personally, it's is just contacts for manufacturers and whatnot. For the step by step guide to starting a clothing like you can totally figure that out yourself. I mean first you need to draw your designs, then you need to price them but if you are not experienced in that yet you make the samples first so that you can price them, once the samples are made you find a manufacturer, then you find buyers, then you get them manufactured.
I mean that's really breaking it down simply but I doubt those books are meant for anyone who already has some knowledge and if you have been researching for a year you probably already know almost everything in them. They're meant for people who don't know anything about the industry and have some half ***ed idea they're going to go out and start a clothing line and so they spend this money on an all-in-one get-rich-quick gimick package and then probably never do anything with it.
Of course that is just my personal opinion...take it or leave it. But if you are concerned about the cost I'd say you are better off buying a book that was published by Fairchild Books as they make most of the textbooks used in schools.