Earlier quoted context omitted.
If you asked any native English speaker what “my X is a phone now” meant, I would wager that nearly all would say that it means that X can now make voice calls, like a phone.
my personal assistant is an AI agent now. Do you think my personal assistant becomes an AI agent or do you think an AI agent is acting as my personal assistant?
However I still think it is phrased poorly as it does initially seem to imply your personal assistant has become an AI agent, but then I have to use additional knowledge I posses (that people can not become AI agents) to correct the interpretation.
I think a better phrasing would be “I now use an AI agent as a personal assistant”. No confusion there. Your phrase can be understood, just like the article title, but it’s not well-written English IMO.