{Shrug} It's onlt a model..
If you can break a low of nature, was it really a law? Or just a suggestion.
"Parity violation", meaning the laws of physics are NOT the same for a mirror image of some interaction, was found in the 1950's. It was supposed at that time that the mirror image with reversed charges ( positrons for electrons etc. ) would restore the identical behavior, so that so-called CP-symmetry would hold.
In 1964, interactions were discovered that violated this symmetry as well, winning a 1980 Nobel prize for the experimenters. What remains is CPT symmetry. See the wiki article on CP violation for a discussion of the relevance of this to matter antimatter imbalance.
This is where these new results come in. Overbye has evidently "dumbed down" his reporting a bit, although I suspect some of this is involuntary. He says the plasma conditions lasted for "only a billionth of a billionth of a billionth of a second". This is better than an article previously cited on FR which said they lasted milliseconds, but this is actually too short, being 10-27 seconds. I found a survey paper that gave the time as 10-22 seconds, which squares better with some back-of-the-envelope considerations I tried.