Given the husband is likely going to die in a few weeks, and the wife is likely already grieving for the man she is shortly going to lose, I think that still places both of them into the "vulnerable" category, and the owner of this technology approached them while they were in this vulnerable state. So yes, I have concerns, and the fact that the owner is allegedly a friend of the family (which just means they were the first vulnerable couple he had easy access to, in order to experiment on) doesn't change the fact that there are valid concerns about the exploitation of grief.
With the way AI techbros have been behaving so far, I'm not willing to give any of them the benefit of the doubt about claims of wanting to help rather than make money - such as using a vulnerable couple to experiment on while making a "proof of concept" that can be used to sell this to other vulnerable people.