I've seen errors like this in internal drafts, but I've never seen anything like this a published, for sale, book. A reviewer's comment was incorporated into the final text.
@springernature.com needs a better quality control system.
Re-emerging poet. None of my e's are silent! Poems in Copper Nickel, Bellevue Literary Review, Boulevard & Southeast Review (forthcoming) 📖 my work ⤵ www.josephradke.com