Motorboating is not a colloquial term for all oscillation. It's a very low frequency instability consisting of a train of pulses which, when played through a speaker, sound like an internal combustion engine with a short exhaust.

The op-amp oscillation the article is talking about occurs in the radio frequency range. Tiny parasitic capacitances induce 180° phase shift at some very high frequency where the op-amp's open loop gain has dropped to unity.

You can't hear this directly since it's not in the audio range. It brings about distortion. The amp may pass audio signal, but the oscillation prevents it from performing properly.