Philosophy is full of demonstrably false ideas where science has caught up and been able to test and find the truth of something, especially in the areas of philosophy of mind.
Granted, popular opinion on consciousness has changed since this was written, but what scientific finding has changed since that contradicts the book's ideas?
I'd recommend the book Consciousness and the Brain for a recent-ish (2014) take on what science currently knows about the easier problems of consciousness at least.
Or, in other words, becomes science.
Philosophy is full of demonstrably false ideas where science has caught up and been able to test and find the truth of something, especially in the areas of philosophy of mind.