The translation is of the Luo Jinhua DVD of the same eight changes as the Jiang Rongqiao book. Luo Jinhua learned from Sha Guozheng, who learned from Jiang Rongqiao. The similarities and differences with the book are interesting.
The translation is very exact, even the missteps and corrections, and the times are indicated so that you can follow the video. If you have the DVD, this translation would be useful as the subtitles aren't that great.
The e-book translation price does not include the video DVD. I have no more DVDs left to sell, so you need to source them yourself.