After reading the description, I thought: Let's see if this author has given the sword a personality that clearly separates it from humans. But nah, of course not. If that talk was coming via a radio link/telepathy from a remote observer (human), not from the sword, it would make more sense. If an author is capable of actually writing an inhuman intelligent sword, they probably won't be writing isekai trash. I'm excluding here intelligent swords that gained the intelligence by having a formerly human soul, like Tensei Shitara Ken deshita.