As far as I can see, there are no OS X-specific features in 'zip' - and hence it doesn't preserve resource forks.

Read the comments before yours. The Finder-based "create archive" most certainly does preserve resource forks. I've proved that in Panther (10.3.9) and others did in Tiger. The author of the tip either got things confused or didn't take the difference into account when writing the tip. The headline is a bit of a scare, as it is not true for the way that most people will zip a file/folder, using the "Create archive" option in the Finder contextual menu.

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I repeat what I said in an earlier comment: the article and my comment that you quote are about the command-line version of zip.
This is reflected in the (revised) headline for the article.

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