Likely they think that the upgrade is mainly (maybe exclusively) for people playing via game pass. The $5 more is because you didn’t buy the game to start with. They did the same with FH5 when that launched I believe.

Apparently they gave that guy (who had never built a PC on camera before) like less than a week to put that video together. Should it have gone out? No, but it’s not the guy in the video’s fault. Source: https://youtu.be/QKzmYsySGFQ