It was misspelled in the original article title as well (although spelled correctly on the author's table of contents page for the same article). I've sent her a feedback on it, maybe she'll fix it.
Meanwhile, the Mods have corrected it here already.
SPELLING COUNTS WHEN YOU ARE TRYING TO PERSUADE PEOPLE THAT YOU ARE WORTH LISTENING TO.
I agree. Typos in posts are reasonably excusable (as long as there aren't too many), but typos in headlines look really bad on the "latest articles/posts" pages, and give a poor impression of FR to newcomers.
It would help too, if the death date was correct - it's June 5, not June 6.