While these conversations are undeniably hilarious to listen to, it's a little concerning to me that by the end of the conversation the only explanation you could really come to here is that he has dementia. If this countermeasure becomes widespread, I'd be concerned about unintended consequences for actual humans with age-related cognitive decline.
For example, imagine an older person who easily loses track of the conversation picking up the phone to talk to a telemarketer. The telemarketer mistakes this person for a bot, and yells at them in frustration.
This might be mitigated by adding some actual AI, so that the bot can convincingly imitate a person without mental health problems.
The telemarketer assuming they are talking to a bot is possibly a better outcome for the older person than the telemarketer taking advantage of their mental state.
For example, imagine an older person who easily loses track of the conversation picking up the phone to talk to a telemarketer. The telemarketer mistakes this person for a bot, and yells at them in frustration.
This might be mitigated by adding some actual AI, so that the bot can convincingly imitate a person without mental health problems.