It should not be assumed to do so. A function intended to maintain prepared food has a different purpose from thorough cooking.
What the observation means
The permitted foods, cookware and duration are defined by the appliance instructions. A warm pan is not evidence that raw food has reached a safe condition.
A useful next step
Use appropriate cooking guidance and the correct programme. If a zone seems only mildly warm, establish whether keep-warm was selected before describing a heating failure. Do not leave perishable food indefinitely on a low setting to compensate for uncertain performance.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.