It's not even an issue of whether the software is compatible. The software asks the drive if it is lockable. The drive says "no".
It's not the software saying the drive can not be locked, it is the drive saying the drive cannot be locked.
The software will go ahead and send the lock commands to the drive, even though it does no good because the drive won't accept lock commands period - regardless of the software.
This is a case of false advertising. Their website clearly states that all their drives are fully ata compliant and fully supports locking. The tech support says the exact same thing as well.
There are probably tons of people who don't know much of anything about computers, and the techs are bombarded with stupid questions. How do I install a hard drive? How do I install Windows? How can I connect the hard drive to my microwave?
They probably assume that all people are like this, because 90% are. So, they give everyone a "canned" response about how "their drives work fine, you need to contact your computer specialist."