Earlier quoted context omitted.
>Aka, that you could clone Harry Potter's plot, characters, and story while not copying each word of the book verbatim, and it still be a copy of Harry Potter. Would that be a copyright infringement? Probably just trademark infringement at that point?
It’s generally not trademark infringement to refer to the actual thing the trademark refers to (”nominative use”). This would actually be a claim unlikely to succeed unless you are intentionally claiming that are writing the true original Harry Potter stories.
I don't know if their beef is with copyright vs trademark.