The main thing that sticks out is that the author mentions how referrals are the number one source of leads for basically every freelancer. The problem is that he only mentions it. Ok, that's great. How do I get referrals? The issue is that none of the other stuff matters if you don't know how to get referrals.
The author did a good job with the post, but I can't express how important it is to be a people person when freelancing. In order to get referrals you have to get projects. In order to get projects, you have to leave your house and meet other local business owners. That's very hard for freelancers to do and I think the post would be 100 times better if the author spent a little more time on that aspect of freelancing.