The change to 45 points was probably directed by Microsoft.
They probably wanted to do so to keep Game Pass subscribers and to make multiplayer look even more thriving.
However, history repeats itself and due to negative feedback from the community, it was fix again.
Another reason, I guess, is that this update was made with the Chinese market in mind.
As evidenced by the review bombings on Steam, many gamers in this country are patriotic in both good and bad ways, and tend to use the review function as a place to express their opinions on developers and publishers.
If the update for them, and the main feature of the content was 45 point rewards, the negative feedback from their huge market could be more than we can imagine.
Microsoft and PG may have chosen to avoid that risk.
We have no complaints at all, though, because the result has been a lot of benefits for us.
PS:
The pink Ford GT can probably be redeemed with a code that comes with cosmetics and is only available in some countries.
I saw a post about this cosmetic on reddit a few weeks ago.