I think you are right, next week is the week after Oct week 3 so by the article's premise we would pull our money tomorrow and sit out next week and get back in on October 25th. Sept 2021 "nasty week" was 9/20 to 9/24. Since this is based on S&P 500 we would look to what happened to C fund that week. Getting out on the friday before (9/17) share price was $66.66 and back in on the following Monday (9/27) was $66.82 so we would have actually missed a small gain. That being said, that Monday and Tuesday (9/20, 9/21) had a decent drop but it was made up by the end of the week.
Interesting article though.
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