My guess is that they would've topped up the reservoir with new fluid, as some fluid will definitely be loss during the hose change. This was the case for me - they topped up the reservoir but did not drain out the old fluid, as the PS fluid is still looking dirty as sh*t.
Even if you refused to pay extra for them to flush the entire system, they'd still have to top up the PS reservoir. So if you don't want the PS fluid changed, simply tell them "no" when they ask you for the extra $127 or so!
Personally, given that genuine PS fluid is $18ish per litre (RRP I believe), and you'd only need 2 bottles max (needs 1.1L for a full system disassembly according to the service manual, so you may get away with less), I'd be inclined to change out the fluid yourself if it makes you feel better! There's a DIY here for the EG/EK/DC2, but the same instructions apply to the CL9. The return hose is the smaller hose higher up on the reservoir, and the service manual actually suggests slipping in a smaller hose inside it so that you can drain the fluid outside the car.
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