Only after all the water is either absorbed into the rice or evaporated, the temperature in the pot rises above 100 degrees Celsius and the thermostat signals that the rice is cooked. The rice cooker then switches from “Cook” mode to “Warm” mode and you can attend to it at your leisure.
A slow cooker attempts to maintain a setpoint for a given time period, usually.
Is this right?
A slow cooker/crock pot keeps a consistent (and relatively low) temperature for a period of time. Some have timers, some don't. Some have thermostats some just have high/low settings.
Only the super-cheap ones, e.g. the chinese-import-for-$15 model.
Good ricer cookers, especially those from Japan (where rice cookers are something of an obsession, and bowl thickness/composition is a definite selling point) often have much much thicker bowls.
For medium price models (~$100-200) this can be 5-6mm thick, and on expensive models (I've seen them for up to $1500!) like 10-15mm of metal or 20-25mm of ceramic etc (or some secret combination).
Modern Japanese ricer cookers can also have very sophisticated heat distribution and control mechanisms, and are usable for a lot of different stuff.