If you follow the instructions as described, your databases on your secondary will go SUSPECT
You have to create the DMK and Certificate on the secondary BEFORE you create the DEK.
If you are reading this, you probably already followed the step by step instructions and ended up with SUSPECT databases. Here's how to fix that:
As long as you've created the DMK and Cert on the secondary at this point, you should be able to go into the AG on the secondary and right click the database and resume data movement, which will bring it back to a synchronized state.