Interlacing: a method of "drawing" images on a screen by "sketching" every other scanline first before completing it with the other half.
3:2 Pulldown: a method of converting 24fps material to NTSC framerates.
PAL uses the same interlacing technology as NTSC. They just have different framerates and color encoding. Therefore, PAL material is encoded as interlaced: because each full frame equals each frame of film doesn't make it progressive.