TranscedentKid said:
It would be really awkward if it turned out there wasn't a basis for something he said.
Let me tell you how pop-sci truthfulness works from the point of view of a field I know a bit more about than what you're looking for.
Say, you read a book describing the Big Bang, and at some point it says it was like an explosion. The part that is factual is that there is a theory called Big Bang, and it has to do with the evolution of the universe, so the book does inform in this respect, as otherwise you might never even have heard of it. But the part about it being an explosion is misleading - a word chosen for whatever reason, be it laziness, en effort to simplify too much, etc.
So, after reading this hypothetical book, you should keep the keywords, and if there's something you think would interest you, look it up in more detail. See if the explanations given can be reinforced, or should be rejected.
If, however, you end up taking away the sound bite 'the BB was an explosion', you'll end up mislead and possibly misleading other people if asked about the concept.
Or, maybe you're reading a book where the author is a fan of the idea of zero energy universe. His bias will permeate the book, and you might end up thinking that's just how it is, whereas in reality it's not at all as clear-cut as it was portrayed.
And again, if the book whose goal is to popularise science prompts you to look up and learn more about the concept mentioned, then it worked rather well. If it makes you believe you now know that the universe has zero energy, it has failed.
People here have a beef with Kaku, because more than many he writes to entertain, often about stuff that is about as good as fantasy. And an uninfomed reader may not be able to tell the difference between where a documentary ends and Michael Bay begins.
So, let me repeat - read his books to get the handle of what concepts are out there, and in what context they exist. But keep a sceptical mind, don't fool yourself into thinking that you now know the field, and do your own research later on. It's easy when you know what to look for.