The transmission fluid point is somewhat plausible as in a full hydraulic system, atf is considered contaminant

If you look at some land cruiser forums, the 80 series etc with the 1fz and 1hd use a power steering pump that is geared to the crank and has a similar steering box like old mercedes

Members there are using mobil dte light, some use mil 5606h, some use genuine GM power steering fluid (which is great IMO and cheap too)

Genuine ac delco fluid is a hydraulic oil that has atf cold flow properties.