I'm saying practically any voice with the associated bubbly flirty personality is going to make you think of the movie Her in such a context.
Sure they leaned into it for advertising purposes but a tweet referencing it and showcasing the one voice that sounds like her out of the five isn't crossing the line imo.
I think it's a slippery slope to say any AI assistant that has a similar timbre and personality as an AI in a movie is off limits.
As long as they don't infringe by calling it "Scarjo" or saying "From the movie Her" I don't see a problem.