Seems perfectly normal to me.

Is your argument that the only people who are allowed to be called "engineers" those who have a degree with the word "engineering" in the title?

Via Wikipedia:

"An engineer is a professional practitioner of engineering, concerned with applying scientific knowledge, mathematics and ingenuity to design and develop solutions for technological systems problems. Engineers design materials, structures, machines and systems while considering the limitations imposed by practicality, safety and cost. The word engineer is derived from the Latin root ingenium, meaning "cleverness"."