You do struggle to understand and get things right - The description you were looking for, for the Citroen suspension, was 'hydropneumatic'. It was a liquid (oil) combined with air suspension. Having both driven Citroens, as well as ridden in Citroens in that era, I found it rather wallowy, rather like being at sea. As you rightly suggest, the major point was the suspension able to cope well with a highly variable load. I also seem to remember BL tried a similar idea, on some of their vehicles, such as the Princess.
No, I think it's more a case of you struggling to read? That's why I said "... (albeit not in the form we see on most air-suspension cars today)". I'm afraid I saw you coming from a mile off with that comment....
Having owned two DS, two CX and a BX, over the years, I'm pretty familiar with the oleopneumatic system they use, but thanks for the "lesson" all the same. If you want to try and get smart, it's not hydropneumatic, because there's no "hydro" involved. That's just a popular misnomer. And while I'm putting you straight, the spheres were nitrogen-filled, rather than air. BL's idea was the Moulton "Hydragas" setup, which was a sort of "pound shop" version of the Citroen system, with no engine-driven hydraulic pump, so it couldn't self-level.
To be honest, I am finding your constant bragging and defence of your EV, and it's 'special qualities' rather tiresome.
Yes, I'm sure you'd prefer it if I just rolled-over and lapped up the BS, rather than try to set the record straight. However, I quite like the idea of "truth" - I'm old-fashioned like that, you see. However, if it's proving tiresome for you, there is a solution...
If it's really that good, then I am sure it will sell itself, without your help.
Ultimately, I'm sure they will too, but the lies, negativity and BS is hampering that transition, and, as I've already said, I can't abide that...