It's a resume piece and the parent works for a design company. He's not looking to start a discussion on the merits of the design and how to improve it, only his problems with it from a hiring perspective (polish, consistency, lack of research). It feels very constructive to me.

Then what separates constructive criticism from just criticism?

Parent comment supplied criticism – I'm not arguing that. But s/he did not at all help to reveal a path towards a better outcome. That's what would make it constructive.