I don't have any positive feelings about AI interviewers, but I don't believe your take is correct. I agree that it does filter as you describe, but it's just a side effect.
I think the actual reason is simply that they're lazy and don't care.
Add to that the AI fad where somehow they find it cool to have AI do something they (or their employees) used to do.
Yeah, exactly. "We're leveraging AI! Efficiency gains!!" and who cares about the actual humans on the other end.