While we're on the subject of mistakes we found in each other's writing, let me quote something you wrote in the E-mail I am responding to...
"...there are mistakes that are simply basics of writing, things that have always been wrong and always will be wrong..." Impossible; If anything is part of "the basics" of anything else, that means it is the exact opposite of wrong. For future reference, "wrong" means "incorrect", such as your claim you found basic mistakes in any of my writing, or that several people pointing-out a same mistake means it certainly is. (Simple look at past election results, etc. would prove it is possible & has occurred that several people will make the same incorrect observation, &/or people very-experienced at something will do that thing wrong for a long time... It simply means, especially in the latter case, that nobody has corrected them, not that they should still be given the right to correct what they tell me is a mistake that I have in reality been right on all along.)
I agree a person may need outside opinions/eyes to find flaws. However, if in any given cases (not all, as nobody is perfect), a flaw is found in one person's work by another person or even a group of other people, that does not mean the flaw truly exists. (Alaska, after all, was once known as a man's "Folly".) It is just as possible that the person/people claiming to have found the mistake(s) is/are the one(s) making it/them.
Your "offer" remains on the table, as I will not take it.