I absolutely second that. What fundamental flaws?
Apparently he meant this article:
I'm too tired to analyze all parts of the article. Let me just point 1 thing out:
What Im not for, however, is prematurely deprecating critical parts of bitcoin (zeroconf transactions and low transaction fees)
The author works under the premise that these transaction are fundamental parts of Bitcoin. The right description would be: "these are dangerous, and you shouldn't use them, because you will lose money, and people who know better will laugh at you".
I will get back to this, but even if these points are true they sure aren't 'fundamental flaws'.
His views on 0-conf and fees are orthogonal to a discussion on LN.