Pixel 4 for $5 a month or Pixel 4 XL for $10 a month when adding a line on AT&T

Went into the store yesterday to add a new line and they had this deal so I ended up buying a Pixel 4 as well. It’s a 30 month bill credit, not an up front discount. And you still have to pay tax on the full value of the phone. Deal appears to be on the 64 GB model only.
https://www.att.com/buy/phones/go…black.html
https://www.att.com/buy/phones/google-pixel-4xl-64gb-just-black.html?