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Why? The metallic plate is factory-connected to the element port, and is not detachable and not a replaceable part. And once the plate has dissolved around element, then the thermostats are free floating on a loose metal plate, and might not read correct temperature of water.

This is good example of expensive heater that seems to promise trouble-free life except has hidden risks for the customer from the use of non generic parts, like elements, and vacuum valve, etc ... and parts must be 'manufacturer authorized components.' or it voids warranty. Manual page 4
... even more ridiculous that a single thin metal plate can render entire water heater into the landfill ...because the simple metal plate has no replacement protocol and the poly resin tank is not recyclable.

The upper thermostat ECO reset button can trip if thermostat wires are loose and begin to arc, or if wire melts due to high heat, or if melted plate in upper compartment gets hot ... so yes, in that instance the ECO red reset button on upper thermostat can trip if there is nearby heat source like a short circuit.
The actual upper and lower thermostats would not trip OFF and need 'resetting' like the ECO unless thermostat was somehow damaged. The thermostats would just turn off momentarily until high heat event ended.
ECO is required on upper thermostat as first line of safety in event water inside tank overheats due to failed thermostat or cracked element keeps heating after thermostat turns off. Tank is required to have TP valve to release water during high pressure or high temperature events.