That's a bit dismissive. Goedel was correct about making the US a dictatorship. The fact that the amending clause allows unlimited amendment (particularly of the amending clause itself) means a series of malicious amendments could irrevocably change the constitution to that of a dictatorship and forbid returning to a democracy. Now maybe people would just give up on the constitution at that point, but in terms of the overall legal system he's dead right.

[edit: for more information please see: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2010183 ]