It’s common to say they behave as a particle and a wave, but it’s equally valid to say they don’t behave as a particle or a wave. It’s a distinct phenomena and thinking in terms of large scale things you’re familiar with is simply misleading.
Quantized fields is a much better term. Also collapse of the wave function never happens, only increased entanglement.
The concept of a single particle as a point charge that isn't really interacting with everything around it is similarly flawed. We learn from a very young age to conceptualize that as the building block of matter, and entanglement as something weird. Instead it's the other way around: a single particle with a pure (unentangled) wavefunction is pretty near statistically impossible.
This article is trying to help laypeople have better intuition about things from the quantum point of view. It's full of evocative prose. Arguing about the definition of the word "full" is completely tangential to the point.
The point of physics is to have a unified system where the same description applies to the widest possible number of phenomena. Calling atoms empty or full isn’t a great description but neutrino’s behavior for example lends itself to calling them empty.