I don't know the company or the details. Assume two scenarios:
1. The target company is willing to lie, fabricate code, mix in tensorflow etc.
2. The company will not outright lie, and will answer honestly. However, they are very optimistic about their chances, and about their ability to deliver some sort of AI-enabled solution.
Right now they have -- let's hypothesize -- some sort of funnel and they route bits of code to different developers. They think they will replace some of it. They are using various AI libraries.
Suppose you believe that even if the AI won't eventually code the whole app from scratch, it will make huge strides in certain areas that we don't even know about. These strides will dramatically reduce the cost of making an app (eventually, you believe). Suppose you think that this company is basically an exploration of those areas.
In other words, be generous to the diligence undertaker.
Now, how would you know? What steps would you take to that you suspect these people did not?
(Because this is the internet and no one knows for sure: this is a real question, and not a rhetorical attack on people asking why VCs were "tricked")