My personal interpretation of the "tell 'em what you're going to be telling them, tell them, and then tell 'em what you told 'em" advice is to never tell people something the same way twice in the same session.

Poor presentations often do something like this: * You should Foo because of X and Y * We did Foo because of X and Y * We've told about Foo. It solves X and Y

More entertaining presentations do something like this: * Our life was full of problems X & Y - and then we found Foo * We started doing Foo, which solved X & Y - with bonus Q * These folk also did Foo - and found bonus Z

Repetition of the topic isn't necessarily bad. Doing it in the same way, or ritually, is.

Your "how to follow the advice right" looks exactly like mjd's point "Don't repeat; embellish".