I am almost convinced that some are willing to go to hell if it means they do not have to be Catholic. Really.
Does no one notice that our Lord spoke these words after the point at which He stopped speaking in parables (John 16:29)? And, that His parables always began with “There was a man…”, “A sower went…”, “Two men were…” or similar? Very general and non-specific.
“This is My Body” is as specific as He could be.