IANAL, so take this with some salt, but I don’t think Meta is directly requesting the documents, and Meta is probably never going to see them. I don’t think they get to request everything and pick through it to find a defense.

Subpoenas come from the court (which is how they’re able to be legally binding, i.e. you can be held liable—-in contempt—-for not complying), so my guess is that the court will review the various documents for evidence that Simula is or isn’t a competitor, so as to decide both whether they fit the bill as a competitor, and whether they’ll be needed during a trial. I imagine that the court can even decide that Simula does not provide evidence in either direction, so they’ll uninvolve Simula.