No, it does not mean it at all. I can give you a lot of examples (around a dozen of Dortmund players alone), where the personal details were already agreed on before the clubs reached an agreement on the fee. It is one of the biggest reasons for agencies and the power of agents.
And that is actually assuming that these reports of these "advanced talks" hold any merit, which I highly doubt. When it comes to internatonal transfers I follow a simple rule. If there is something to a story, there are sources from both sides which report it independently from each other. In this case there was a lot of English paper talk but the German side was awfully quiet, both the boulevard and the media close to Dortmund. Now, some might chalk that up as something that might happen when it comes to the BVB as internal matters very rarely got to the outside for years. Problem is that by that time there was already someone on the inside of the club feeding information to the press (by now pretty much everybody inside and around the club assumes it was Olaf Meinking, the personal agent of Tuchel). If there would have been something more to the story, let alone something huge like an agreed fee, there would have been a hell lot more noise about it in Germany. So sorry, not buying it.