When I read an article on Time today, I encountered a structure that I haven't seen before. Here it is:
Millions of commemorative plates bear his portrait, a Mona Lisa smile leavened by the benign air of Winnie the Pooh. Poets lavish ornate verse on him–“My eyes are giving birth to this poem/My fingers are burning on my cell phone,” wrote one amateur bard in February, describing his search for the perfect paean. Bookstores across China give prime display to his collection of speeches and essays, which has sold more than 5 million copies, according to state media. His ideology is even enshrined in an animated rap video, with one line that goes: “It’s everyone’s dream to build a moderately prosperous society. Comprehensively.” A killer rhyme it is not, but who cares when you’re almost certainly the most powerful ruler on the planet?
The last sentence, "A killer rhyme it is not, but who cares when you’re almost certainly the most powerful ruler on the planet?" looks unfamiliar to me. Is "A killer rhyme it is not" equivalent to "Although it is not a killer rhyme"? Can we end a sentence with "it is not"? Is it very prevalent in English writing?