That's addressed in the article, its still not as big of a revenue source.

Although the author did mention this in the article. I still wonder how much some of these indie games would benefit from partnering with a marketing consultant. Listing a game on steam is basically free marketing for the game. The author mentions only 1% of his sales are from direct sales. I wonder how much having an experienced marketing pro could improve that percentage.

That's because despite all the complaining about Steam changing things, it's still far better than all other ways of selling their game.

Personally, I think Steam is correct to change their algorithm whenever they think it'll help the buyers find games that suit them better.

It's also very possible that other developers have seen a bump in sales that correspond with the decline for this developer.