S.T. Joshi's new Cthulhu anthology will have a story from Tom

[In A Dark Light]

Gorgeous cover art.

I received 'A Mountain Walked' for Christmas but have only just gotten round to reading it. Just about to finish off the third story in the anthology: 'Spawn of the Green Abyss'.

[hopfrog]

My story is yet another manifestation of my obsession with "Pickman's Model". It's a wee thing of 4,700, and although I swore I wou'd stop trying to use Pickman as a character in my fiction, I couldn't resist shewing him in Part One of ye tale, although under a different name. My story was not intended for S. T.'s anthology, originally meant to be one of ye unpublish'd original tales for my forthcoming Centipede Press collection; but S. T. liked the story so much that he insisted he use it in THE RED BRAIN. I'm really looking forward to this new Mythos anthology.

[Robin Davies]

I've been reading A Mountain Walked and I was a bit puzzled by Patrick McGrath's The Wreck of the Aurora. Though it's a vivid story, I didn't spot any relation to the Cthulhu Mythos, anything supernatural or even the "undercurrent of weirdness" that S. T. Joshi notes in the introduction.
What have I missed?