Yes, you can read fiction and novels like this, but when you actually want to learn something? Do you really think you are able to comprehend complex ideas by just going scanning the text? If so then, you wouldn't be here. It works on some level obv, mostly to find information. There is no need to read the whole book if you are looking specific information, therefore you scan it. Everything has its own place, don't buy this marketing crap people are trying to sell you.
Well, like rogue said there are ways to improve your memory (which I have done) and there, I have seen succes.
But you are wrong when you say scanning
The course I'm looking at (which I ripped, so I didn't pay) contains basically 3 steps
1st Improve memory, else you will never be able to remember everything you read
2nd Preread to gain motivation. 1 second prereading, where you catch up details, and ask yourself questions, why/how/when about these specific details. This will give you more motivation and therefore, more concentration when you eventually will completely "speed read" the whole thing
3rd Speedreading, remove the subvocalization and make use of the techniques you earlier learned
I will try my best to update this thread when I see some progress.
I have gotten better memory, when I use the techniques. However I'm having problem with using them on a daily basis which makes it hard to going onto the next step and eventually speed-reading