Very few Chemical Engineers or Material Engineers are PE’s. Those are ABET accredited curriculums. Are you saying they are not Engineers? Professional Engineers are licensed because they serve the public for which they take an oath to make public service they’re highest priority. The Engineers ring represents that oath. However an engineer with an ABET accredited degree who does not serve the public is no less an engineer. They are just not licensed to serve the public. I’ve worked with a lot of Engineers and though PE’s are uniformly top notch, some of the best I’ve worked with we’re not PE’s.
If they make shit that routinely breaks like software then no, they're not real engineers.