Mr Dastardly wrote:The host seems to have reached a high level of Korean, and attributes his success primarily to Repetitive Listening.
A Le Baron says, it's very hard to tell which component of your learning was the most effective. I often say, the most useless praise is "I learnt more in 3 days with X and than in 3 years of night classes", because that doesn't demonstrate that the new method is independently successful - it may just be filling in the last gaps.
My approach to repeated listening in the past has been much like others here have said -- start with a transcript to read and understand, then listen again later without a transcript, allowing memory and familiarity to aid my in picking things out from the audio.
With Scottish Gaelic, this was mostly material slightly above my level (a resource called "letter to learners" targeted specifically at upper-intermediate and advanced learners). With Catalan, I was using the Assimil lessons I had already completed, so everything was at my level.
With French and Spanish, I took a different approach. I had a good general level, but listening was my weak point.
I started listening to albums of songs, and the language was mostly within my level; although occasional words and phrases would need some clarification.
So what I did was learn to sing 1, 2 or 3 songs on the album with the aid of written lyrics. With every song I learnt from the same singer, every other song by the same singer would become more comprehensible -- I was tuning my ear in to hear them specifically. But it also generalised, because these were native speakers with native accents. I quite quickly got to the point where I could often identify the bits I didn't understand well enough to look them up directly in a dictionary without first having to look up the lyrics (more so in Spanish than French -- thanks for nothing, French orthography!!)
So yeah, to me repeated listening has been extremely useful, but I can't imagine it being the core of my "method" and I can't imagine doing it without transcripts.
I tried watching the video, but I couldn't get through the initial barrage of bad analogies, and it really sounded as though he was overstating his case. I was quite curious as to whether he would actually address the whole thing of having enough knowledge to start repeated listening, but not curious enough to sit through 25 minutes of YouTuber waffle.