Never compared the density of nuclear matter to the planck density of 'empty space' consisting of planck particle pairs?
No...and the sky still ain’t solid...
What the hell are you talking about? The only time the density of the universe was close to a Planck density of 1 (~5.1 × 10^96 kg/m^3) was about 5 x 10^-44 seconds after the Big Bang (according to modern theories... which I thought we didn't accept around here).
As far as "planck particle pairs" (which has nothing to do with your link, btw; just a rambling psuedo-scientific jumble attempting to piece together disparate snippets of "scientific" discussions), you are obviously confusing two separate ideas. A planck particle is a hypothetical particle, and one with an exceedingly small lifetime (1 x 10^-44 seconds and an even smaller size (1 x 10^-20 the radius of a proton). No one can give a convincing account of how we could detect such a particle... much less any evidence of its existence. As for a virtual particle pair, these are a well accepted feature of modern physics, but, outside of a few obscure and infrequent events, basically average out to a vacuum.
So, in other words, you seem to be repeating terms you have heard somewhere, but don't have the slightest clue what they mean...