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I’m a graduate student in the cognitive area of psychology; specifically, some of my work deals with reading and speech comprehension. All I can say is that most of the advice you gave above is not true:
1. Backtracking (or regressing your eyes to previously read words) is often a sign that the reader missed something in the text. Backtracking is seen when you’ve skimmed over a word that is new to you, for instance. Although there are studies which show that good readers perform fewer eye regressions, not performing them is not a bad thing. If a poor reader does not perform backtracking, this means that they decide not correct mistakes in comprehension!!
2. Speed reading. Yes, good readers read faster, but it really depends on the text. Most evidence points out that if you have a difficult text material to process, take your time. If you are a good reader, it is fine to speed read a NYT article or novel, but if you speed-read with textbooks, expect your comprehension to drop significantly.
About the rest of the advice, I don’t know if it work or not. Vocalizing words probably slows down reading, but let’s be honest, reading fast at the expense of comprehending the material is not worth it.