They're talking about an AI we build, the term "alien" in "alien intelligence" refers to it not having human thought patterns, not to extraterrestrial origin.

And the thought pattern here is more akin to "I ended the last paragraph with 'origin', followed by a 'period', so it's likely that the next word is 'And'" rather than anything actually useful. All current AI does is statistics. During training, the Neural Network learn statistical rules about their training data. This has exponentially decaying marginal utility, and exponentially increasing marginal costs. So, the problem the AI companies likely already have is that they can't efficiently train better models, because there isn't enough training data. And even if they could, they wouldn't be able to turn a profit on it, because it would be barely better than the last model they output, while having to charge maybe twice as much to break even.

By aliens they mean incomprehensible, not extraterrestrial