It’s been so long since I used a ][+, I forgot that there was a right arrow key. I thought there was only a backspace ley, but there was, along with a “rept” key which I’d completely forgotten (not to mention that horribly-placed reset key).
That is probably in the top 3 most common English typos, made millions or billions of times a day by native English speakers, up to and including people with PhDs. The issue the author is complaining about is completely different.