Read well the article and look the type of 'AI', is a AIM/targeting one, nothing specially really, not what you can think as really artificial intelligence, simply is able to optimize targeting / launch times, and as well adaption on flight of the missile trajectory and variables due to a higher and better throughput of information's incoming from 'bigdata' real time analytics of many inputs and sensors on ground / air / space and on the missile itself, think it as an optimized high precision autopilot for jets on a missile

ps. note that, similar solutions are widely sold for an immerse number of applications