So my guess is that this was not a trace of milk (cross contact), but a whole lot of milk. Either that, or this person has some serious milk-tasting chops.
https://www.fda.gov/safety/recalls-market-withdrawals-safety-alerts/gelato-boy-issues-allergy-alert-undeclared-milk-chocolate-chunk-gelato
Gelato Boy Issues Allergy Alert on Undeclared Milk in Chocolate Chunk Gelato
Summary
Company Announcement Date: June 14, 2023
FDA Publish Date: June 14, 2023
Product Type: Food & Beverages Ice Cream/Frozen Dairy
Reason for Announcement: Undeclared milk
Company Name: Gelato Boy
Brand Name: Gelato Boy
Product Description: Chocolate Chunk Ice Cream
https://www.fda.gov/safety/recalls-market-withdrawals-safety-alerts/gelato-boy-issues-allergy-alert-undeclared-milk-chocolate-chunk-gelato
Gelato Boy Issues Allergy Alert on Undeclared Milk in Chocolate Chunk Gelato
Summary
Company Announcement Date: June 14, 2023
FDA Publish Date: June 14, 2023
Product Type: Food & Beverages Ice Cream/Frozen Dairy
Reason for Announcement: Undeclared milk
Company Name: Gelato Boy
Brand Name: Gelato Boy
Product Description: Chocolate Chunk Ice Cream