A “professional” writer that doesn’t know the difference between affect and effect?
Pretty hard to take anything seriously after that, no matter how ‘well-researched’ the rest may be.
Why can’t Johnny read? Nobody knows how to write anymore!
We didn’t see his original.
The misspelling was most likely caused by spellcheck on the computer the article was typed on.
Many otherwise very good articles published on the internet contain errors that would have been found and corrected in the old days.
Surely you know this.