I’m mostly going off of this article and a few others I’ve read. This article notes:

Celebrities have previously won cases over similar-sounding voices in commercials. In 1988, Bette Midler sued Ford for hiring one of her backup singers for an ad and instructing the singer to “sound as much as possible like the Bette Midler record.” Midler had refused to be in the commercial. That same year, Tom Waits sued Frito-Lay for voice misappropriation after the company’s ad agency got someone to imitate Waits for a parody of his song in a Doritos commercial. Both cases, filed in California courts, were decided in the celebrities’ favor. The wins by Midler and Waits “have clear implications for AI voice clones,” says Christian Mammen, a partner at Womble Bond Dickinson who specializes in intellectual property law.

There’s some more in there:

To win in these cases, celebrities generally have to prove that their voice or other identifying features are unregistered trademarks and that, by imitating them, consumers could connect them to the product being sold, even if they’re not involved. That means identifying what is “distinctive” about her voice — something that may be easier for a celebrity who played an AI assistant in an Oscar-winning movie.

I think taken with the fact that the CEO made a direct reference to the movie she voiced an AI assistant when announcing the product, that’s enough that a normal person would “connect them to the product being sold.”