Correct, but get it anyways. Once you get it, even if you do not install it, you have it free forever. So when we do get the unlock, you can still install it.
OR if you do not want to root your device but still install it, download the app store from Amazon, use the
sideload wonder machine to install it. Then sign up and get PvZ. When it downloads and fails to install, backuout and then open the app "Files" and navigate to the folder
/android/data/com.amazon.venezia/cache. The downloaded apk will be in there. Then use the sideload wonder mechine to install it. It is a lot of work, but it is a fun game, esp since it is free.