Can delta sigma dac bypass oversampling filter?

[Curupira]

By looking at the output with an oscilloscope or soundcard with good treble extension.

NOS will show ugly stair stepping/distortion (left and right column):
View attachment 491017

Only with oversampling On you will get correct reproduction of the original waveform (middle column).

You mean that the most marketed sampling feature, NOS, actually goes against the second most marketed sampling feature, which is to get an untruncated sine wave?