Well, true and not true. The recipient's iTunes will erase the iPod once it's plugged in, if the iPod is registered to another computer. Furthermore, casually browsing the iPod's hard drive will not reveal the song files.
However, there are apps out there that allow you to transfer songs from the iPod to another Mac, sans iTunes. Now, for protected AAC files, these tricks won't work. They won't be playable unless the recipient's Mac is one of the 3 registered Macs assigned to the owner's AppleID.
So, yes, and no.