Deflickering video

[bencuri]

I would like to deinterlace and upscale this video to FullHD, but there is a serious problem being present: there is some serious flickering in it at some parts. I tried the Deflicker filter, but I am not an expert, and the flicker is not reduced at all in the end. Could you suggest something to remove it? This is the link to the video:

https://drive.google.com/file/d/1wuWtK2orPsBkOsgLeVU4HupdEaonwWIW/view?usp=sharing

Please download the video and watch that way because interestingly the preview is not flickering.

This is my code at the moment:

LWLibavVideoSource("Wenge - Kaskito.mpg")
ColorMatrix(mode="rec.601->rec.709")
Crop(0,8,-0,-0)
QTGMC()
DeFlicker(scene=30)
SMDegrain(thsad=1000, tr=3, prefilter=4)
nnedi3_rpow2(2, cshift="Spline36Resize", fwidth=960, fheight=720)
aWarpSharp2(depth=5)
CAS(0.5)
nnedi3_rpow2(2, cshift="Spline36Resize")
CropResize(1920,1080, CropDAR=4.0/3.0, Resizer="Resize8", Borders=true)
aWarpSharp2(depth=5)
CAS(0.5)
Prefetch(4)

[Selur]

Add AssumeTFF() before deinterlacing and SpotLess after.

Please download the video and watch that way because interestingly the preview is not flickering.
Same frame rate deinterlacing is used instead of bob deinterlacing, thus frame order doesn't really matter.