I often go with the logotype's x-height and it generally about 0.3 of the logo in my designs. But what I mean is do you think is there enough information about clearspace on that screenshot. For example wouldn't it be better if height is also stated as 5x ?

So I would know if I'm going to use it in a website, when I set the logo height to 50 I could add a margin of 10 or if I'm going to put it into a poster I would calculate how much space I need at least.