From a language learning standpoint that does make sense. Over-exageration while you are learning to help cement the idea, and then when you are speaking more naturally you will fall back into a regular kind of tone.

that's EXACTLY how I taught myself to speak with a Spanish accent from Madrid. I repeated the way tv celebrities and the speakers on the metro announced the stations, and it gave me a base for how to use my mouth and throat appropriately. After a while I was able to tone it down and my accent got so good that locals couldn't tell I wasn't spanish - I had this cool party trick pulling out my id and showing them I was truly a foreigner!