I am reasonably certain that the word "typo" connotes
an accidental strike of the key, not an intentional
decision to spell a word incorrectly.

What these guys are talking about are not "typos",
they are grammatical and/or spelling mistakes.

I personally find the misuse of apostrophes to be more
bothersome and offensive than spelling errors, which can happen to anyone(except, of course, to me...).