Thank you for keeping care of that Citroën Activa. A car that must be preserved for its historical and technological significance.
The first video mentions that Moose test as well, and references a channel that tries to do re-attempt it, but fails; I've seen that video as well, and it's pretty clear that those Xantias are not performing as they should; and no where in that video, are there attempts to fix the underperforming suspension. Likely, I suspect, because none of them truly knows how that is supposed to look like. The best description I've heard of the car is that it handles like a go-kart, which feels rather apt.