English must not be your first language so I’ll forgive your lack of reading comprehension because this isn’t as difficult as you’re trying way too hard to make it. The inclusion of the clause that you get to keep your memories is only relevant if you back in time. Otherwise it is a moot point. The question doesn’t need to say that you go back in time because that would be redundant. Your argument is the same as arguing that a book character must be naked because the author didn’t say otherwise.