Could you please explain the methodology used?

As you yourself understand it? For example, how is Bitcoin's fair value calculated? I think we don't need a lot of formulas here, just a brief description which would be sufficient to see if this methodology has any substance and is actually applicable to the task in question

Personally, I'm interested in how they estimated money velocity, i.e. what data was taken as basis. I'm certain that they used trading volumes but I'm not sure if it is a legitimate metric for measuring intrinsic value just because you can actually calculate something which can be remotely called a money turnover rate