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Can anyone not related to the company attest for this course? Does anyone else know of a soft skills course they recommend?

Yes, I can attest that the course and company are first rate. See previous comment -> https://news.ycombinator.com/item?id=20508974

I can't, but I answered your second question in this thread, here: https://news.ycombinator.com/item?id=20508585