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That would indeed be a realtime system by common definitions as long as that latency is guaranteed. Audio and video are commonly considered soft-realtime domains for exactly that reason.

Yep. If you mean low-latency, say that. Real-time is an unfortunate name, but it means what it means.

And phone … callthatju arousmpnnd is n’t realtime.

Technically not relevant but I know that a lot of early handhelds that repurposed RTOS for GUI felt slow, jumpy and unresponsive, perhaps because everything was polled? In that sense RTOS can be slow.

I think it felt that way because of bad design + slow hardware. You see the exact same thing by installing a modern windows version or some desktop like GNOME to low-end computers.