You're misunderstanding the blog post. It says: That means you must collect and pay sales tax from any taxable sales made to customers within the state of Texa

You're misunderstanding the blog post. It says: That means you must collect and pay sales tax from any taxable sales made to customers within the state of Texas. So if your servers are in Texas, and you make an online sale to a customer in Texas, you (apparently) need to charge that customer sales tax.