The way I interpret that message is that kapt will still be around but it won’t receive any significant updates.
So if you own a Kotlin annotation processor, good to move it to KSP.
And if you use annotation processors in your Kotlin project, good to move to to KSP as well since you can avail of performance improvements. Completely eliminating kapt Gradle tasks from your project is likely to mean faster build times:
https://twitter.com/ZacSweers/status/1270988203332435970