Most of the spelling errors in their post were &#x27;wrong word&#x27; errors, aka the [Cupertino effect][0]. A spell checker would not have found those. It&#x27;s possible they were also relying on auto-completion, which increases this type of error.<p>[0]: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cupertino_effect" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Cupertino_effect</a>