If you read the article, you'd see..
What the GPL changes is the commercial benefit. Under MIT, someone can take Asahi's code, close it up, and sell a product, and that's perfectly legal as long as the notice stays in.
Under the GPL, anyone who distributes a modified version has to release the source under the same license. You can't legally build a closed, paid Apple Silicon distro on top of GPL code. And if a product's source has to be public, the copying is easier to spot.
The article explains that the GPL license will enable legal action against future use along those lines - and that WINE did the same thing back in the 90s, and its worked for them.