I don't get this reply. GP didn't say anything about parsing algorithms, they said (correct) things about hard errors on the web.
I thought they were just bolstering the refutation of TFA's assertion that XHTML is strictly better because of its parsing algorithm.
why for? the reply is about factual historical experience with webpage hard errors.
Would you like to have a law that forbids you, under penalty of fine, to read any book you buy or borrow that is lacking or has damaged pages?