This description fits only for protons at such ultrahigh energies that even the most advanced experiments will probably never be able to detect them.
See? It's only calculation based on Relativity, not actual experimental data.
If you read the whole article instead of quote-mining it for damning-looking sentences, you will see that that's incorrect.
They modelled, performed experiments, and compared the results. That's how science works. The fact that the article also mentions what happens in the models beyond the experimentally-accessible regime doesn't change that.
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.