Hehehe, it is the 737.

However, despite having shot myself in the leg, what I said in principle stays true. Only that the PMDG-737 for FS9 is many years old, and never became a favourite of mine, due to it having several issues that never got resolved. The new iFly 737 is much, much better. However, PMDG has redone the 737 for FSX from scratch, and not just "translated" the old FS9 packge, so the FS9 version in no way should be seen as a hint for the quality of the FSX version now.
FS9 users will not see this new plane, so they are left with the iFly 737 anyway. From the video, the FSX 737 looks like a prime argument to get and try FSX, too. Fantastic.