If you read the article carefully you will note that the experiment proved that the effects of the disorder could be reversed if a treatment is found. Whereas everyone expected them to be permanent.

They did not however find a cure for rett syndrome, they found a cure for a fake rett syndrome they created in a cleverly reversible way. They inserted blocking genes in front of the gene responsible for the disorder and then used a treatment which could actually remove the block in the grown mice that grew from those genes, they did nothing to the actual gene. If the genes they started with had been mutated to begin with then the treatment wouldn't have cured them.

The article makes a big deal about it sort of being a cure, at least for the mice involved, but whats really interesting here is the fact that damage from genetic neurological disorders might not be irreversible if treatments can be found.

so yeah one day you will all stop reading the internet compulsively and gaming 24/7 and just sit calmly in front of the television like normal people.