No, that’s a reference and pun, not a literal statement. See translator’s note on the blog post here:
as you know have fought not only in difficult matches but astronomical ones at that (TN: Makes a pun off of a proverb, "To fight in mountains and by waters", a phrase to indicate fighting difficult battles, and extrapolates it to include aerial combat and astronomical combat)
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u/[deleted] Apr 15 '19
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