Not really. Our Halloween has very little to do with Samhain, the celtic celebration it’s based on. The author is referring to the American reinvention of the holiday as candy day. Candy day is all American.
Keep telling yourself that. It has everything to do with the celtic occult, the jack-0-lantern, the candy, everything ... It was brought over by the irish, started mostly in New York and spread to the rest of the country.
“Candy day is all American.”
That’s it, the crotchety Brit is probably jealous because he can’t eat candy with his typical bad Brit teeth.