I think it is very very important to not ignore traction boosting activities early on. It is very important to build a brand, get users engaged, and have people ready to try out your product when it launches. I think one thing that the article doesn't mention though is that if you are doing this before you are delivering value to customers with your product, you need to make sure your messaging is not just trumpeting your horn. The communication/engagement strategies should be building real value for your potential customers. People just tend to pay more attention to people who are constantly providing them things of value. Lots of people forget or don't realize that the value you provide doesn't only come from your product.