Motion and Time Average Plugins Applied

I was given advice from a senior developer who rewrote the Cinelerra Motion plugin, and the avice is in this email:
email by Georgy

The files are all available here on my web (the shaker.tar.gz as well).

And that email is the starting point for this attempt of mine.

If casual visitor wants to follow here, pls. read and understand the email by Georgy and follow the instuctions there.

First, this is how I produced the screencast below:

ffmpeg -y -f x11grab -nostdin -loglevel quiet -s 1920x1080 \
    -r 30 -i :0.0 -c:v libx264 -preset ultrafast -threads 0 \
    Screen_$(date +%y%m%d_%H%M).mkv
and that gave me Screen_220927_1840.mkv, by the time I started that command, but I do not make that available, I've preferred recoding it to lighter WEBM:
ffmpeg -i Screen_220927_1840.mkv -c:v libvpx-vp9 -crf 45 \
    -b 0 -row-mt 1 Screen_220927_1840.webm
which shows how my attempt went:
Screen_220927_1840.webm (for dowload), or view it on/from this page:

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Here's the file that got produced during the 11 minutes shown:
motion-shaker4
shaker1-orig.webm
shaker2-AFTER.xml (but don't try to open it in a browser)

I give shaker2-AFTER.xml for download, because I opened shaker2.xml and worked with it, but upon closing Cinelerra, it offered me to save, and surely I saved it, and renamed to shaker2-AFTER.xml.

It didn't work as expected. Why, yet to find out.

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The files necessary/used/produced are listed in: pg-220926-motion.ls-1
and verify to these SHA256: pg-220926-motion.ls-1.sum
signed: pg-220926-motion.ls-1.sum.asc
with my public PGP-key).