I watched the video. You need to check impulse response IOT see pre and post echo not the frequency-amplitude based oscilloscope graph.Not exactly. There is no problem of an "artifact" here. The "pre- and post echo" ripples are a natural result of the signal being bandwidth-limited.
This is explained and very well demonstrated here, at 17:20 in the video. It is worthwhile watching the entire video, as it dispels with a lot of false myths around digital:
The presenter of the video is as ignorant as people who believe there is no difference between usb cables or digital cables at all. If he had used a dCS vivaldi instead of cheap plastic dac that he used in the video the results would be the same on the oscilloscope screen. Does that mean dCS vivaldi sounds the same with the cheap dac? Certainly not.
The first thing to learn in this hobby is; if there is no measurable difference between two signals it may be due to inability of measuring equipment. Use your ears.