That's just wrong. In the original comment, "as" was used as a preposition and not as a conjunction. But it is grammatically incorrect to use the preposition "as" to draw a comparison instead of "like". See for example: http://dictionary.cambridge.org/grammar/british-grammar/as-o....
You all bring up good points, and I agree that the usage was imprecise and/or wrong, though the original comment did, IMO, contain enough information that you should be able to deduce with a significant probability (in the Bayesian sense) whether or not I am, indeed, the great French historian Henry Rousso!
Ah well. You win. Congratulations? I'm not here to argue over grammar. It seems like you have sufficient grip on the language to have understood the comment you quibbled with.
This isn't a competition. While I appreciate that you were only trying to be helpful, in reality proposing false theories doesn't add anything of value to a discussion, especially when the issue can be settled with a basic web search.