The political landscape has changed since the previous white papers were released and this is a much needed update to address the current tensions. The new document isn't a threat, but rather makes clarifications about what circumstances would require China to use force, and reaffirms the goal of reunifying China and Taiwan using peaceful measures.
If China truly cared about Taiwan's political autonomy, it wouldn't be scratching the promises it made in its previous white papers. The removal of its pledge not to send troops, coupled with the recent military drills in the Taiwan Strait, serve as a warning that the sovereign state and its Western allies should prepare to defend the island from a likely invasion.
There is a 25% chance that China will launch a full-scale invasion of Taiwan before 2030, according to the Metaculus prediction community.