You aren't missing anything. The CD's (which the Startek site is hosting) just have a very generic "maintenance sheet" that doesn't even appear to apply to the W126.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

So I need to find a hard copy?

i have several DVDs which had been offered by MBUSA which I believe are no
longer in production. The one I use for w210 models was pretty decent and
are excerpts pulled from the WIS documentation. The interface is not intuitive
for me but bearable when needed.

The information within was less so a step-by-step, photo by photo but it was
still geared for the model and not generic. I saw the same line drawings found
in the WIS repair service

ebay item # 201936019739

https://www.startekinfo.com/StarTek/outside/7594/?requestedDocId=7594

Buying and Maintaining a 126 S-Class Mercedes by Nik Greene

Mercedes-Benz W 126: Die S-Klasse - Das beste Auto der Welt (German Edition) by Heribert Hofner (if you can read german)

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-- raymond~
47º 34'N 122º 18'W