If they work professionally in IT, then they're by definition "IT Professionals".

Absolutelly, the definition of "IT Professional" starts at lower (or maybe the correct term would be "more generic, maintenance-oriented and less specialized") levels of domain expertise than "Software Developer" and most people out there's contact with an "IT Professional" won't include a software developer (even in the average business, which is unlikely to directly use Programmers but will almost certainly use the services of System Administrators and Network Engineers), but saying they're not IT Professionals would be a bit like saying that the people who design cars aren't Auto Industry Professionals, only Car Mechanics are.

Mind you, I don't disagree that Programming is closer to Engineering: my point is that Engineering IT Systems is still a profession in IT, just like car design (in the technical sense) is both an Engineering practice and a profession in the Auto Industry.