solderdude
Grand Contributor
That was an output of a concrete guitar amp described in the article, in its overdrive (clipping) mode. The article is pretty educational. Such guitar "amp" is not really a conventional amplifier per se, but a highly-non-linear electronic musical instrument, which is controlled by yet another highly-non-linear electromechanical musical instrument - the guitar.
So it was a clipped amplifier output signal and there are still no axis to the scope plot so we really don't know what the frequency was nor the amplitude.
Have you seen what the speaker will reproduce when fed with that amp output... something totally different !
The goal of hifi reproduction is to reproduce that faithfully. So far you have not been able to show that even 44.1 can't reproduce the sound of the electric guitar coming from a speaker that is limited to around 4kHz.