Earlier quoted context omitted.
There’s still ambiguity in verbal language. On Sunday, if someone messages you “let’s do this next week” - do they mean “in the next 6 days” or “after 7 days from now”?
Almost universally meant to mean in the next 6 days. Next week implies after 7 days.
Edit: also on a Friday, you can say next week and mean Monday (3 days later)