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No to both questions.

Why on earth not?? "if any one eats of this bread, he will live forever", "he who eats my flesh and drinks my blood has eternal life", and "unless you eat the flesh of the Son of man and drink his blood, you have no life in you" are not ambiguous phrases. They are just as straightforward as "This is My Body". The author of the article certainly argues for a literal interpretation of these passages:

Notice with what solemnity (``Truly, truly...'') and how many times he reaffirms this teaching (vv. 53, 54, 55, 56, 57, and 58). Each of these verses is a categorical affirmation of the crowd's understanding of his words. There is no indication that Jesus is speaking figuratively here; we must humbly accept the words of our Lord, even though if it require a great leap of faith.

Sounds like this Catholic is telling us to take Jesus at His Word. No Eucharist, No Salvation. With Eucharist, guaranteed salvation.