Welcome to the community,
Interesting first choice of topic 
For this particular DLC we had to license the rights to include the actors likenesses.
And due to licensing restrictions, movie content can’t be in the season pass.
I hope this explains 
Some additional info regarding different online stores:
We are allowed to call something a Bundle if it’s past content.
A Season pass lable is used for specific content in the future. That is not limited to meaning ALL content but you can’t call it a Season Pass if it’s content that is already released.