There's no doubt that YouTube has made a number of these topics far more accessible. The inclusion of videos along side typical text searches means that it's just as easy to click on an article as it is one of those videos. There's also typically a multitude of options that each might cover the same topic from certain angles and varying degrees of overlap.
These videos are typically uploaded by creators who are passionate and incredibly enthusiastic to share a key aspect of their lives. Many of the popular educational channels have a passionate creator behind them, rather than a flatter more lecture based approach like you might get in typical coursework (which is also on YouTube, but isn't nearly as widely consumed).
Lastly, I can find a 5, 10, or 20 minute video that's focused on a specific subject or topic on YouTube as opposed to going through 60 or 90 minutes of coursework/lectures that are predefined. I can jump from video to video, carving out my own path to learn what I want, rather than sit through a lecture that may not be discussing something particularly of interest.
The Tacit knowledge that's referenced in the article is certainly there in many of the videos on YouTube, but is not the main driver behind this "revolution". It's the ability for anyone in the world to dive nearly as deep as they want, lead by content creators that are genuine passionate about the subjects they cover.