According to the courts Amaral's book was based on the facts of the investigation. It followed the facts and the conclusion of the investigation as at 3rd September 2007. Nothing since has proved that conclusion wrong, it is still as valid as any other theory.
But nothing has proven it to be correct, either.
In fact, no one on here (unless I blinked and missed it) can make his theory work in practice. And the thread on what Amaral actually got right is still one of the shortest on this forum, yet there are numerous sceptics on here who could have contributed if they'd wished to.
Why would his greatest fans invent wild conspiracy theories if his theory was plausible? Surely, they wouldn't need to.
In theory, if some nutter had made a police statement to the effect that the McCanns were responsible for the current crisis in the Middle East, or that the McCanns had transformed the moon into green cheese, he would in theory be free to reiterate that on any TV show that will host him, simply because some lunatic had said so.
How can anyone in the sceptic community applaud his theory as being the "truth", while apologising for so-called "minor" errors, such as she a) never existed, or b) died days earlier than what he believed happened or c) any one of the bizarre and unsubstantiated explanations?
With a few exceptions over time, most sceptics on here appear to be lucid enough to realise that his understanding of key issues appears to be somewhat flawed.