Looking at the sample, I agree with you. Condensed ≠ easy to understand. Honestly, a lot of the graduate texts I deal with look easier to understand. In my opinion, every single concept should be introduced with physical analogies if one wishes a reader with no maturity in the subject to actually understand. Then again if the author is going for "no-bullshit" this could serve as a good reference for someone who just needs a quick easy to understand reference.