So ... from this perspective, HPL was a purveyor of fake news?
Robert Block et al are the purveyors of fake news in this perspective, not HPL.
from
The Dunwich Horror (Events in 1928, three years after the events of
The Call of Cthulhu)
"Great Cthulhu is Their cousin, yet can he spy Them only dimly."
At the Mountains of Madness describes a history of Cthulhu in great battles during the "
vigintillions" of years before homo-sapiens appeared on Earth.
As far as HPL stories go, Cthulhu is mentioned in five stories,
The Call of Cthulhu, The Whisperer in Darkness, The Shadow Over Innsmouth, At the Mountains of Madness, and the historical treaties
The History of the Necronomicon.
The only appearance of Cthulhu outside of R'yleh during the era of homo-sapiens in HPL's writings is in 1925 when Cthulhu storms out of his house to yell, (in translation), "Get off my mossy lawn" to some pesky sailors. (mere zygotes to Cthulhu's reckoning of age). And then these sailors have the temerity to ram him with a steamship. As far as the only living witness (Johansen) knows Cthulhu returned to his home and sank back down to the ocean floor. Think of the story from Cthulhu's point of view. Johansen and his crew murdered Cthulhu's houseguests while they were traveling for a visit, stole his houseguests' steamship, and then came knocking on Cthulhu's door.
Cthulhu's worshippers seem insane, but according to HPL Cthulhu did in fact rise again, looked around for what appears to be an hour or so, and then returned home and went back to sleep.
from
The Call of Cthulhu
Cthulhu still lives, too, I suppose, again in that chasm of stone which has
shielded him since the sun was young. His accursed city is sunken once more,
for the Vigilant sailed over the spot after the April storm; but his ministers on
earth still bellow and prance and slay around idol-capped monoliths in lonely
places.