I don't know. Perhaps for better accessibility or to reduce the risk of accidentally damaging the radiator. Is there enough room to get at it without taking the bumper off (my car's still in the garage so I can't check).
I found this, which suggests an alternative to the pin wrench. Seems to be a for a PF A8 but it may help:
http://www.audipages.com/Tech_Articl...n_removal.html
Quote:
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Using a 10mm wrench on one of the four fan pulley bolts to hold the fan still, loosen the large nut holding the fan onto the pulley
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Mark
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2002 FE S8 Ebony Black Pearl
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Cars Owned:
The Tesla Era: 2020 Model S Performance Ludicrous+ (present)
(Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability)
The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present)
The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo
The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust