The copywriting is incompetent. In short, Harry died after the war due to Voldemort's final curse, and traveled through time to become his father, o(╯□╰)o.
Look at how this little Harry (James) has been eaten to death by the little professor since he was a child.
Newcomers write articles, and the thunder is light.
Professor Gong, Sheng Ziwen, Lei's dear, don't jump into the trap easily.