You've done well so far by checking the fuel system and linkage but something besides the ALDA is your problem. These engines aren't total dogs without the turbo, the non-turbo 190D 2.5 should hit 60mph around 15 seconds. Even with a totally plugged or dysfunctional ALDA the car should not have an acceleration problem that bad.

Does it smoke at all? If it does, what color?

Check if your brakes are dragging.
Check that you're really starting in 1st or 2nd instead of 3rd or 4th.
Check if the turbo spins freely (with the engine off).
Check boost pressure.
Check if the EGR is stuck open, then make a block off plate while you have it removed.

I'm looking forward to that video, it should help a bit. Please also video a few seconds of the engine bay with it running while you've got the camera out.