That might be handy if we didn’t already live in a day and age where everyone is carrying a device that can put them in touch with a live person 24-7.
It’s not literally everyone, and people do have batteries die. I’m all for putting those call stations at regular intervals in public transit and other areas where it’s plausible they’d be used.
I’m less sure the utility of serving the same functionality, but with a much more expensive robot. Realistically the entire purpose is to normalize people to seeing them as police officers, and I’m skeptical that that’s a positive.