I remember listening to a podcast interviewing a vermicompost expert. She mentioned the leachate/tea conundrum. Yes, The leachate is a viable fertilizer. But one that is slightly anaerobic compared to the rest of the bin. The problem is that if you have excess leachate, your bin is too wet which is why it becomes more anaerobic.
Balanced moisture is the goal, but swings in either direction dont equal failure, just less than ideal conditions.
I have also watched the Geoff Lawton video and while his method works well, he also ends up with a very wet, sticky, vermicompost. A consistency that can be difficult to work with.