The spacetime continuum contains a timeline by definition.
It's fine if you don't believe me
even though it is pretty clear cut from the wikipedia page. Here is a thread you can read:
Summer times is the only good time to be starting mass projects to revise every profile of X tier and what not; second, Sera Ex still had plans to define the difference between 3-A and Low 2-C feats. And while yes, it is true that destroying an entire timeline is the requirement at what a Low...
vsbattles.com
This is a comment by Ultima in reply to a question that is similar to yours. If I'm not wrong this should give you more faith in my argument. For reference the specific comment is:
Summer times is the only good time to be starting mass projects to revise every profile of X tier and what not; second, Sera Ex still had plans to define the difference between 3-A and Low 2-C feats. And while yes, it is true that destroying an entire timeline is the requirement at what a Low...
vsbattles.com
Read the entire conversation and it should clear up what I am saying.
Kaguya created a timespace = spacetime = spacetime continuum. Which means it has a temporal dimension. The replies should prove to you why that inherrently means that a timeline exists. The only requirement here for Low 2C would be to prove the spatial dimension to be infinite. Hope that clears stuff up.
Edit: Btw if you want an explanation from me too then here it is: The existence of a temporal axis means that it will have past, present, and future. That's how a line works regardless of it's length. The temporal axis isn't a point, it's a line that stretches out an unknown amount. The default assumption of a spacetime is that it is continuous.