The Pixel 6 is already available for US$100 lower than its retail price, one month after its launch. The saving applies to all configurations and colours, including all 256 GB models.
https://www.notebookcheck.net/Google-Pixel-6-down-to-US-499-in-Black-Friday-sales.580428.0.html
This article is incorrect. In order to get the sale prices mentioned in this article you are required to get a new line of service. The article incorrectly states that you have to activate them, but you need to get a whole new line of service. The deals are effectively useless for most people and the article is misleading and unhelpful. At least the other articles mentioning these deals got the information correct.