Think people are misunderstanding the tweet. Based on other translated tweets, it looks like Kadokawa has been looking to sell for some time, so they may have engaged in talks with other companies before Sony.
That Sony involved and talks look like they'll be wrapped up within weeks, we're looking at this being a done deal by the end of the year...
Massive move by Sony.
As previously reported by Reuters, Sony is considering acquiring KADOKAWA. A spokesperson for KADOKAWA said, "At this point, nothing is definite."
I think the other players are still involved. They probably DO want to get Kadakawa, but I highly doubt it will be easy for Sony if Tencent or someone else is involved.