This is pointed out in the research article, but the overall idea that matter-antimatter pairs created in the vacuum are connected by a wormhole is due to Wheeler. The twist here is that the result is obtained by applying ADS-CFT duality first, so the calculation is done in a 5 dimensional gravitational theory. A more accurate statement would be that under ADS-CFT an entangled particle state in 4 dimensions probably can be modelled as a wormhole in the gravity dual, which is not entirely surprising.