Ooooooo Very intriguing thread! 3 different writings, 3 different results:
Arthur Clarke - consensus is xNTx, some argue INTJ
H. P. Lovecraft - consensus is INTP or INFP
David Foster Wallace -consensus seems to be INTP maybe INFP
Perhaps, given all three, a pattern will emerge? Or is the link in the OP a joke/ scam?
"Sir Arthur Charles Clarke, CBE, FRAS (16 December 1917 – 19 March 2008) was a British - Sri Lankan science fiction writer, science writer and futurist,[3] inventor, undersea explorer, and television series host.
He is perhaps most famous for being co-writer of the screenplay for the movie 2001: A Space Odyssey, widely considered to be one of the most influential films of all time."
https://en.wikipedia.org/wiki/Arthur_C._Clarke
"Howard Phillips Lovecraft (/ˈlʌvkræft, -ˌkrɑːft/;[1] August 20, 1890 – March 15, 1937) was an American author who achieved posthumous fame through his influential works of horror fiction."
https://en.wikipedia.org/wiki/H._P._Lovecraft
"David Foster Wallace (February 21, 1962 – September 12, 2008) was an American author of novels, short stories and essays, as well as a professor of English and creative writing. Wallace is widely known for his 1996 novel Infinite Jest, which was cited by Time magazine as one of the 100 best English-language novels from 1923 to 2005."
https://en.wikipedia.org/wiki/David_Foster_Wallace
The pattern emerging to me is:
INTPs generally. So check on this one (unless INTP is generic to most of the writers referenced on the OP link in which case this is an insignificant. I'm going to guess quite a few writers are generally INTP/ INFPs. So there is slight significance reasonably speaking).
All three are big picture thinkers, ponderers, philosophers, fantastical in their subject material. Check.
All three were at least somewhat reclusive curmudgeons. Check. *sigh*
All three came from generally middle class/ upper middle class backgrounds. Check.
Two died rather early deaths (suicide and cancer). The third ostensibly from old age basically. If I am to extrapolate I have a 2 in 3 chance of dying from suicide or cancer before the age of 50 then.
...in summary can't decipher if the OP link truly classifies according to 'word choice' (content?) or 'writing style' (whatever that is)...
Based on the content I entered into the link, classification per 'word choice' may very well be legit.
would be curious to have access to the algorithm being run here...still don't know if its legit...may be...