No. In the original Harry Potter series, there is no such concept of absorbing fanfiction. The story is set within its own magical world with its own set of rules and events, and fanfiction is a creation outside of that official narrative.
Definitely not. The official Harry Potter story is a carefully crafted narrative by J.K. Rowling. Fanfiction is a product of fans' creativity, and there is no mechanism in the original story for Harry to interact with or absorb fan - created works about Voldemort. It's two separate realms, the official story and the fan - created content.