I watched this really awesome video last week. That video was titled something like, "Trump isn't saying anything."
First, it went over some obvious optical illusions where 2 people can come up with opposite conclusions depending on their bias.
Next, it showed examples of politicians giving answers that were ambiguous and could mean anything. Next, it showed how Trump was the master at giving ambiguous answers with various examples, making the point that Trump does this as the rule, not the exception.
But what he does with the results of that technique is truly amazing and most of your post covers this. He is able to twist a person's bias out of proportion by purposely allowing the listener to run away with their imagination. It's only rare strategic times that he will reign the listener in with clear statements, and it is ONLY with his base, and only when it won't calm his opposition.
Anyone with a higher IQ can see exactly what has been going on since day one. Trump is using human biology against us as any clever magician would.
This is why you should never listen to the words but rather look at the policies and the results. Stop looking at the magician's hands because you will never see the trick. Look at the results.