By being intentionally vague, a lie by omission. They could have easily included something that made it clear a different actress has the role as compared to the previous games, but chose not to.

They also used the word "recast" to imply a change was made in the casting of The Witcher 4, whilst this isn't the case. They simply went with a different actress as compared to the previous games, which is casting and not re-casting. I don't know if anybody expected the same actress after such a long time between games?

They would also be well aware of the sad reactions to the trailer because the lead in a game isn't a man. So I content they intentionally chose this title to imply some sort of a reaction in the casting in response to the trailer. And judging by the number of up votes and people saying the same thing, I don't think I'm alone.