Except he doesn’t actually. Because the whole story is an allegory. His description of the location is no more telling people where a real place is than Lovecraft’s description of R’lyeh.
Oh geeze, I just realized in 2000 years gullible are going to be looking for R’lyeh. And Innsmouth. Etc etc. Oh boy, Lovecraft really screwed up the future.
“Except he doesn’t actually. Because the whole story is an allegory.”
Yes, the story is an allegory, but he still places the action of the story in a specific location, which is beyond the pillars of Hercules, in the Atlantic Ocean.