So does this mean that PFAFF has sold the rights to their IDT technology to Singer to use? I have a PFAFF Creative 1.5, and the IDT foot looks very similar to the Singer C240. The description of the video linked below refers to it as "PFAFF IEF".
https://youtu.be/vDztkdtXai8
Amazing that this machine is $399 on Amazon right now. If the feed system works well, it's a bargain.