Did you read the article? It clearly spells out how it doesn't contain any more energy.
This is about a small improvement in efficiency, and depending what they do to raise octane might be more toxic. Not up on current octane chemistry but some things they have used in the past were pretty bad.
... I know little of cars or engineering or how motor fuel is made but I know General Motors like the back of my hand, I've worked there since the early 1900's and I'm Mary Barra's boss. God asks me for mechanical advice.
Well, that would pass the added cost of meeting efficiency targets onto the consumer. So, I guess I can see why that would be better for business.
If an automaker was actually "in-bed" with petroleum refiners, they would push for low compression. This would increase fuel sales. It would reduce production costs of ICE powertrains.