Actually, it is entirely true. But don't fret... this legislation is misunderstood by a great many people. You're simply misinterpreting the legislation in this instance.
It is NOT illegal for wireless companies to lock phones... nor is there any legislation that requires them to provide an unlock code for a locked device.
The legislation you are referring to simply makes it "not illegal" for an end user to unlock their own device. It's no longer a crime, or a violation of any kind, for a user to unlock their GSM device.
There is nothing in these decisions or rulings that require a carrier to provide unlock codes or unlock services for their locked devices.
See here: U.S. Copyright Office - Anticircumvention Rulemaking
There's a big difference.