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I have seen these advertisements and videos fairly frequently recently. I have used dishwasher tablets with limited success. But nothing compares to using raw citric acid purchased from Amazon. 1 cup of citric acid and a clean washer cycle removes more hard water minerals and gunk than I have ever seen anything remove. I have used it on multiple machines with the same results. Of course, most of us here won't have as profound of an effect since we tend to use warmer washes, appropriate amounts of detergent, less (if any) fabric softener, etc etc.
That Samsung in the video probably had build up from cold or cool washes, and any mild detergent in a hot wash with aggressive agitation will remove some things, especially if it is that bad. I haven't used these tablets, but I would stick to Citric Acid considering my results.