Sony increased their shares to 10% - becoming the largest shareholder they have.

The quote also implies they’ll be working more closely together on Sony related IPs

By combining KADOKAWA’s extensive IP and IP creation ecosystem with the strengths of Sony, which has promoted the global expansion of a wide range of entertainment, including anime and games, we plan to work closely together to realize KADOKAWA’s ‘Global Media Mix’ strategy, aimed at maximizing the value of its IP, and Sony’s long-term vision, ‘Creative Entertainment Vision.’"

This probably disproves the rumors that Sony will outright buy Kadokawa.