If you notice - in the full length video i.e. one of the plates is slotted, and when inserted into the top obviously from the outside in - leaves an open space towards the chassis, when prying the spring outwards - the plate with spring will slide across the shaft and and release itself from the tool, launching the now free to shoot spring.

IMO this is an example of not using common sense.

OTOH I have just seen one of my neighbors replace springs and bushings on a 202, he loosened the arm bolts, tied a nylon ratchet strap in the spring and chassis and lowered the arm slowly, at the last 1 or 2 inches he pushed the arm and yanked out the spring - replacement was reverse with the help of a tongue shaped flat bar tool inserted from the lower arm hole to keep the spring in place.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)