It's probably not interlaced, but the fields are out of alignment, making it appear to be interlaced.
The simple test for most PAL sources is to add Yadif(Mode=1) to a script and step through the frames. If every second frame is a repeat of the preceding one (or very close to being an exact copy), the source isn't interlaced. If every frame is unique where there's movement, it is interlaced.
You can probably fix it using TFM() to put the fields back together.
Quote:
TFM() # from the TIVTC plugin
AssumeFPS(24000,1001) # optionally undo the PAL speedup.
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I say "probably" because I haven't seen the source and there was almost no motion in your sample. For de-interlacing issues, it pays to upload a clip containing a fair bit of motion, if you can.