You need to think a little more 'Old Fashion' regarding a Rice Cooker. Most new Rice Cookers are based around how fast. So, change that to how more traditional and you will start finding styles that are designed to use your Range / Stove and not a self-contained unit. Also, the traditional units commonly make more and I think better rice. The down side is that, they can take a little longer and there is more clean-up. But if you have a Dish Washer, its not a problem. If not, you just soak longer prior to washing. NOTE: Also, you likely did not have enough water to start with!
So, regarding the do it fast and clean it fast stuff; You are correct that the 'normal' operating temperature should be below the temperature in which off-gassing occurs. Problems: All the studies are based on the original Chemistry, application and thickness of that coating, and the original thickness and material type of the base material (stainless steel). None of those are followed today due to price point and a lack of manufacturing controls.
What that means is that thin base mild steel and thin /flaking coatings can fail at much lower temperatures. In addition, as the original studies so very clearly showed, the most common failure occurs because of human's multi-tasking in the Kitchen, commonly with things that have nothing to do with cooking.
Turn the Smart Phone OFF and enjoy Traditional Cooking!