Well, it’s been quite a while since Kotlin was announced as the official language for Android.I don’t see any dates or news about a Kotlin course to be included in the near future here.
Codecademy can’t release courses on any existing language (given there are hundreds, and thousands of libraries)
Java is still the official language for android, but android allows any programming languages that can be compiled in JVM (java virtual machine)
There are more languages which support JVM, kotlin is just one of them
Codecademy is always working on new courses, but by far not the only source from which you can learn programming. If a language isn’t here, its easier to find it somewhere else