It's all open for interpretation. What, you think he's going to spill that it's totally Taylor-centric? Of course, the closest we got to him confirming it was Harry's reaction to James Corden's cheeky line of questioning. His face says it all...
Still, this go around, in an interview with ET, Harry's asked directly, "Is it about Taylor?" His answer is a polished little gem, that drops no hints whatsoever.
He explained, "Obviously, you write a lot of stuff from personal experience, but it doesn't necessarily have to be so literal. People can interpret a lot of different things in different ways. And I'm not going to tell someone it's not about what they think it's about, because I think the whole point is - it's about whatever it means to you."
Such a well crafted answer, Harry! And that, we expect, is going to be his go-to any time he gets asked that question...he'll never tell!