I don't know. I'm taking that argument from authority and posting it, in part, to remind myself to reprocess the ideas when I'm better prepared to receive them.
The following link trail conditioned my interpretation:
Zero-Knowledge Proof is a very new, very speculative field with few if any academic research - plus, it is currently plagued with the trusted accumulator issue (you have to trust the very first "user"), scalability issue and, more intrinsic to the procedure, issues with wholly obscured economy, which prevents detecting a bug/exploit until it is much too late. Also, ZKP is considered doubtful.
Where the author here hyperlinks to the above article with 'doubtful'
The blogpost you linked to is explaining, in detail, with a worked example, that zero-knowledge proofs are possible. The only thing in it that even slightly matches the reddit guy's view is the sidenote near the beginning pointing out that just because someone claims a cryptosystem is zero-knowledge, doesn't mean they're actually right, or that the cryptosystem is secure.
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