Everything outside of encrypted datasets’ data is not encrypted. This includes the things you mention as well as vdev labels, block pointers, etc. The clear t

Everything outside of encrypted datasets’ data is not encrypted. This includes the things you mention as well as vdev labels, block pointers, etc. The clear text bits can tell you a fair amount about the relative age of written data and how much data is present. It will also identify which machine last imported the pool.