Interesting that the title of the blog post is "What you know matters more then what you do". I would say this thesis is incomplete. The author talks about how him and his colleagues were trying to figure out the secret sauce of a high achieving researcher.

FTA:

I hypothesize two things. First, ultra-learning is difficult but it can be cultivated. Second, it might be one of the most important skills for consistently generating impact. Those who are able and willing to continually master hard new knowledge and techniques are playing on a different field than those who are wary of anything that can’t be picked up from a blog post

I would possibly agree with his hypothesis at the end of the post, but not the title. I think its likely that this person is a high achiever not just because he is learning quickly and thoroughly, hard topics. He is also applying the requisite work and determination required to be a success.

So IMO what you do has to be at least as important as the things you know because that is the only way we have in which to judge your success.