What is the name of the seed that Luca / Concrafter is playing in his current Minecraft project (2021)?

What is the name of the seed that Luca / Concrafter is playing in his current Minecraft project (2021)? I would really like to know, even if he has not yet published it himself. But he says he'll do that someday. Is there a way to play the seed before it is released? Perhaps someone has already found it out

I don't think anyone would take the time to find out about this seed.

I thought that would be a shame then I and everyone else will have to wait for the publication.

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