It is not overheating but working as designed. It passes all of the Dell diagnostics. Dell won't replace the motherboard with those temperature readings.
After my 12 year deals with Lenovo, I bought a new Dell Inspiron 15 3511 laptop last month (November 2022) with high aspiration. Once started using it, immediately noticed the keyboard overheating issue. Specifically in the center area of the keyboard is getting overheated after a 10 minutes work in the laptop. I must keep the machine idle for sometime to cool down. The overheating can felt in our fingers while I continue typing. Checked and updated all drivers and features. But no way. Reported the issue to Dell, they confirmed some issues as they fetch some thermal sensor reports and replaced two parts - the fan and heatsink. But the issue was not solved. Dell team accessed my laptop on remote and taken reports again and again. Still the issue is not solved and I am waiting for the next update from them.
Inspiron 15 3511, overheating, keyboard