This is what it really says. Copied and pasted from the Description in the patent document link. No “Flumans”. “3.09563763ENHANCED CAPTCHAS US - 07.02.2017 Int.Class  G06F 21/00 Appl.No 13899146 Applicant Amazon Technologies, Inc. Inventor Gregory Branchek Roth Concepts and technologies are described herein for providing enhanced Completely Automated Public Turing tests to Tell Computers and Humans Apart”