Surviving Mars: In-Dome Buildings Pack

I bought the Surviving mars first colony edition with season pass a long time ago, why do I have to pay extra for this when I have paid for season pass???

Why isn't this included in the season pass?

wut the fuu m8 i got like first colony edition like a year ago or something and with this edition there was like a SEASON PASS YO and even with this SEASON PASS YO i still cant access all the content IN THIS SEASON gg paradox

..."I am happy to see you again, and it is with great enthusiasm that I present to you this Content Creator Pack that I created. For those who don’t know me, I’m Silva, and I started modding strategy and RPG games in 1997. After a very long break, when the excellent Surviving Mars (2018) was released, I resumed modding. I had very little knowledge of 3D and programming, but that didn’t discourage me from making a large number of mods that were very well received by the gaming community. Modding has allowed me to improve my 3D modeling and programming at lightning speed. And today Paradox contacted me to create this Content Creator Pack, giving me the freedom to choose the theme, the features to be added, and any other content. My specialty as a modder is to create new buildings, so I chose this type of content for this Pack. You see, they are not just new building skins but entirely new buildings, with new gameplay features for some of them."