Well, I have no information about those AI experiments, so if you could provide a link I'd be grateful.
That is fair to assume at first glance, but *most*, and I say most because some people are too intellectually impaired, like Downs Syndrome people, have the mental capacity and potentiality to live a spiritual life, given they are provided with the resources and motivation needed.
The thing is though that in life almost everyone has neither the motivation or very bad spiritual resources. I can only speak for myself as a South American, but Roman-Catholics aren't the best source to read up, learn or experience spirituality, they work better as a social control institution in very mischievous ways (plus, the whole pedophilia scandal), therefor, there is no 'guru' figure here. Although I'm a great admirer of the Jesus Christ figure for his message, The Bible has some unremarkable passages sometimes too, and there is no Grand Narrative, in fact the Old and New Testament present extremely opposite figures of God. The Old Testament shows a 'Saturn'/Fatherly figure that must be obeyed or he will punish man and you see that through all the stories. The New Testament shows a more loving and heroic version of God, with Jesus representing God, since he is the focus of the whole story, it's like the Krishna/Vishnu relationship, with God being Vishnu and Jesus being Krishna, mostly God is seen as a loving father of all that preaches love, instead of a wrathful punishing one. Well, the thing is that here most sources can't be trusted and they give contradictory figures of what God is. And I bet to assume that in the more Lutheran world there is much more focus on materiality rather than spirituality, specially in the US where the focus in put on making money fast and fucking a hot wife. There are also the self-help traditions that arguably have good content and honest motives, but fall short on trying to put substance into the teachings, even Stoicism, I personally feel, lacks mysticism to make it more compelling, which Taoism does have.
Then we come to the issue of motivation. Generally speaking spirituality and psychology were understood as one for many years in almost all schools, but the separation and 'scientification' of it made the whole study oneself being focused on psychology and psychiatry. Everything got spread around and there is not one discipline that tries to bring forth valuable empirical spiritual knowledge about spirituality without being clouded by a group of New Age BS cultists. Now you have little to no reason for trying to study spirituality since society tells you: "Go to a therapist or a psychiatrist to deal with your demons" and that is reasonable, but most people do not need it, they need self reflection and mindfulness.
I feel like most roads have been cut and you need to go through very rough ones to arrive somewhere, and that makes most people throw the towel too soon.