I don't know the composition of that ZF additive in the link, but I would bet that it is a friction modifier, designed to solve problems relating to one of the clutches on some models of ZF transmissions. Same problem existed years ago with Ford transmissions, and the additive was designed to help the transmission deal with a hanging clutch in the event that the customer reported problems. Putting the additive in when it wasn't required was worse than using the wrong fluid.

Or, it could be a miracle cure designed to double transmission life. But I doubt it.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue