"I'm not equipped to do your challenge" - really?
"Engineers aren't different" - again, really?
Rhetorical question: you don't want the job, do you?
I am not sure if the issue is with the hiring process, or with the candidates' ego here. Candidates. Plural. As the article's author doesn't seem to be the only one.
Apparently there is a lot of people that believe they are rockstars and they don't need the job, the job needs them. Challenges like this help to figure out non technical skills as well, like: how committed a candidate is; how much he wants that job.
I'd rather hire a junior that is committed than a senior that is not.