It's valid. Engineer means the role requires applying math and sciences. There could be a Potato Farmer, and then a Potato Engineer that measures crops in time

It's valid. Engineer means the role requires applying math and sciences. There could be a Potato Farmer, and then a Potato Engineer that measures crops in time and space, solves growth optimization problems, and researches solutions for plagues, etc. Then there are Potato Scientists that would deal with classification, genetics and so on. The problem is using it as a prestige tag without requiring the skills. The company is wasting resources if they do so.