Jesus Christ Himself said, This is my body
People who want to assert that Jesus Christ was too stupid to make Himself understood will always do.
No matter what sort of lame excuse they make for doing so it all boils down to such people placing their Self and Self Alone above either the Holy Spirit by claiming the Holy Spirit could not and did not protect Scripture from error (a fundamental assertion of all Protestant doctrine) or above both the Holy Spirit and Christ Himself.
May God have mercy on the souls of such folks because they're racing to their own damnation.
Did the apostles and Jesus eat the REAL ACTUAL Physical body of Christ and drink His real actual blood at the last Passover?
Jesus Christ Himself said, "You vipers!"