> If the device performs safety-critical functions, like actuating power, medical equipment, or a connected car, the firmware and software cannot be updated without rigorous testing. If the device requires certification, updating it may require recertification. Updates are disruptive and need to be scheduled when the device is not performing its critical functions. Even just performing the update presents risks: if the update ends up bricking millions of devices and requires manual intervention, it could prove an existential risk to the business or the safety of individuals.

WebAssembly does nothing to address any of this. The least important part about this is the language the code is written in. I think this person has thoroughly confused code running in a VM with code being secure, safe and performing to specification.