Very few Bitcoiners spend it which helps Bitcoins success the most. The sentiment of the post is to make them think differently about the risk of not securing the medium of exchange (MoE) property of money. Money is only money insofar that it can exemplify the properties of money. Medium of exchange is an important one to exemplify. If we don’t win MoE, the value of Bitcoin will be capped from other forms of money winning MoE.
Spending on bitcoin companies helps the most in the long run because it ensures the value of Bitcoin as money when the medium of exchange is Bitcoin preferred.