They say those packets don't qualify for the contraction as they are "not rigid in Born's sens" and therefore not shrinking.
A bunch of particles not bound to each other by anything is not rigid in any reasonable sense I can think of, so what's your point?
Every rigid body is just a cloud of particles. If they are bonded together, they are bonded together with other particles like photons. Or gravity. Or strong nuclear force, as quarks in protons and neutrons.
Also the strong nuclear force is responsible for bounding atomic nucleus together. The force just doesn't stop at the "edge of a proton".
But why do you think they "must be bonded together" in the first place?
As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.