The article makes it sound like the feature set has been finalized, but is that really the case? I'm struggling to find evidence for this, and the official page does not seem to indicate this at all: https://openjdk.org/projects/jdk/23/
If you want see what's coming in Java 23 you have to check https://openjdk.org/projects/jdk/23/ - the only source of truth. If you look at the Schedule of that page you will see at least before Rampdown Phase One there still is time to add new JEPs. And there will more JEPs be added for sure, that's how it was done in the past.