It's worth noting that:
* He's a fan of fantasy and magical realism. His comic book series "The Umbrella Academy" features a group of superhero siblings with supernatural abilities.
* He's a big reader in general. In interviews, he's talked about his love of literature and the influence it has on his creative process.
It's entirely possible that he's read Harry Potter, as it's a widely loved and popular series. However, without a statement from him, we can only speculate.