Nah, it's a little more direct of a refernce than that.
I forget what he calls it, but basically only Hisoutensoku is the adaptation here, but otherwise, he says the same thing about the thing that comes out of the pumpkin field.
Linus and Sanae...two of my least favorites...how fitting. If you've seen "Someday You'll Find her, Charlie Brown" you'll understand my hatred for Linus. And I'm sure you don't even need to ask why I hate Sanae.
But this comic is so full of win, with Reimu/Snoopy's blunt reply.