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brilee comments on The So-Called Heisenberg Uncertainty Principle - Less Wrong
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The Uncertainty Principle, is in fact, an uncertainty principle.
The uncertainty principle is not a fact about quantum mechanics. The uncertainty principle is a fact about waves in general, and it says that you cannot deliver both a precise-time and precise-frequency wavelet. This has implications in, for example, in radio signals, and electrical signals.
In QM, we assume matter behaves like waves. That means that matter now does all the same things waves do, including, as it turns out, an uncertainty principle. Uncertainty has simply been hyped up by philosophers who couldn't add 2 and 2.
Eliezer is just decrying the use of the word "uncertainty". It's not that we don't know the frequency of the wave packet, it's that it doesn't have a single frequency.