There's no ignoring it. It was raised pre-emptively in the very first comment: "the way that "professional" is used as a euphemism in Americans' bizarre discursive repertoire".
> the phrase "unprofessional professional" means
That's just an oxymoron.
> a professional (ie getting paid) who is behaving unprofessionally (ie exhibiting a lack of professionalism)
A professional who is getting paid, the (only) necessary and sufficient condition for being "professional", is by definition exhibiting professionalism. That's a fact, and it's not any more complicated than that.
> the phrase "unprofessional professional" means
That's just an oxymoron.
> a professional (ie getting paid) who is behaving unprofessionally (ie exhibiting a lack of professionalism)
A professional who is getting paid, the (only) necessary and sufficient condition for being "professional", is by definition exhibiting professionalism. That's a fact, and it's not any more complicated than that.