However, the things on YouTube are just a tiny fraction of the DWDs! There are new and thorough explanations for each word and grammar point, step-by-step instructions in how to write Chinese characters and look them up in the dictionary and lots of other stuff.
The You Tube episodes are perhaps 10% of the DWD, if that. So don’t hesitate to buy! Included is a booklet with all the scripts in Chinese, phonetics and English. If that’s not going to catapult you into Cantonese proficiency I don’t know what is.