And so many (dozens) of changes of the kind. Wouldn't that be "creating a new story" using Tintin, and thus contradicting Hergé's will?
You are asking the wrong person...
You are treating this as if there is some way in which you can run a ring around me, and prove a point, as if I was the one holding the rights and making the decisions, and, by, some feat of logic, you will be able to make something happen, or me slap my forehead, and say, "Gosh! You are right!"
The situation is that I am not, and there isn't an answer, or a way to lay out the facts that will amount to a different ending.
Simple truth is that Mme. Rodwell, who, as Hergé's beneficiary, does
control the rights, has principles about what does and does not constitute something which would be acceptable to Hergé, and applies them as she sees appropriate, given her deep and close understanding of - and respect for - her late husband's wishes.
There is no amount of argumentation which will budge that position, and there is no need for her to explain her decisions as to what is and isn't acceptable.
As far as can be told or interpreted from what has been down, she allows for and accepts a deal of leeway for those presenting the stories in adaptation to alter material; on the other hand, new comic-strips would not be acceptable.