Most of what he says is true. However, the article is more of a show-off sometimes, and may unnecessarily confuse people . Example:
> The so called "signal" does not flow along some PATH...The circuit response is everywhere at the same time, all elements at the same time. No flow. Input receives - output responds. At the same moment.
Yes, we know. "Signal path" does not mean flow, we all know what we mean by "signal path"
A couple of things could have been said better. For example:
> Amplifiers, what they effectively do, is REDUCE the output impedance of the output device. So they increase the current available at small impedance loads.
True, but I would have instead said: amplifiers' goal is to modulate the DC voltage of their power supplies to match the input waveform as best as possible, and MAY offer higher output voltage and/or current, but they can also reduce the input voltage [and give examples]
> The signal (current) enters via RCA jack, and the first thing it sees is usually a parallel resistor or some kind of parallel pot. The signal sinks to the ground through this resistor and that's all. Yes. The journey is over.
I think a more accurate depiction is: PART of the signal sinks to ground.