Even at $118k, I still don't know how these guys make any money restoring E9s unless they're really cutting corners somewhere.
So take your time and a deaper look what you see on their pictures. You won't find just a single E9, where they documented a high end (or even bare metal) restoration.
All "nice" cars, no doubt about it, but far away from perfect, if you ask me. Most probably real good survivors I suppose (probably coming from Italy or other non salted European regions. Every advertised example get's the same package with fresh upholstery, paint job, cheap Alpina 16 inch replicas, shooted in a nice surrounding from a rather good photographer. Imho in best case you can jugde these cars in condition 2, but more at the low end.
This specific example has also so many flaws and details, what I wouldn't except for that price level.
The undercarriage wasn't for sure not stripped down. What you can see here is a bunch of layers sitting on the one, that came from the factory back in the days. Then off course freshly painted. Nothing, what's really bad, if there's no rust sitting under it, but I suspect, that there's nothing ...
What really sucks and hurds in my eyes is the engine bay with some obvious use of bondo onto the connection parts between the inner wheel house and fender. Engine just cleaned and touched up with some bling bling fresh parts (new or regalvanized). Once again: nothing criminal or totally uncommon, but far away from what this car tries to represent. But a good example of their process to find a rather good benefit in cosmetics ...
So, yeah not a bad example for an E9, but for 100 K € ??? Never ever !