Very basic in whose judgement? If it's the author's (and presumably yours), fine, but then it's not a business case, it's a shibboleth. If you're agreeing with the author's claim that there is a "silent majority" (which I always find a dubious argument) of people who have their confidence in your business impacted, then you're far better off investing in a process that catches these errors--many of which can be caused by typos, rather than ignorance--before they are seen, rather than relying on an up-front test that's never retaken.

Someone else on this thread made an analogy to push-ups. If, as a business owner, you feel that it's essential for your business that any employee can perform 20 push-ups at any time, is it better to test them before they begin employment, or to put them on a brief training course when they join and have regular check-ups on their ability?

I actually don't agree with the author, so I'm not going to defend him. However, I don't disagree with the author based on the fact that he made some completely understandable mistakes in his own post.