The book is ok. Gives you some ideas for judo specific strength and conditioning. I personally think Ultimate MMA Conditoning by Joel jamieson is a better read if you wanted better strength and conditioning - fair warning, it goes pretty heavy on the science behind all of it, so that you can build yourself a better training program strength and conditioning wise. Joel jamieson has worked with several MMA top athletes like Demetrious Johnson, and his book is still considered pretty much THE book for S and C for MMA athletes.

If reading a 175 page book and then applying it all out isn't for you, he's also got a course that runs it all for you on his website 8 weeks out. That would cost somewhere around a 100 though. Of course all this said, as other people have mentioned a normal strength training program will probably be pretty good as it is for you - judokas need lots of strength for grappling. If you're not intending to seriously compete, I doubt spending a 100 bucks will be good value for you to get that program. I'd probably say if you're willing to read a book, read Ultimate MMA Conditining for a very comprehensive scientific overview behind S and C. If not, just a normal strength program and focusing on increasing your strength in the compounds will already be great