No, classes are classes, objects are created from classes. They are however two different things.

Yes, but he was using keywords (such as public and private declarations) that are specific to PHP5's object handling, so to read his examples, you would need a newer release of PHP.

Weeeeellllll, technically they're called properties.

Cut him a little slack, he may well have been doing the tutorial to learn as much for himself as to help others, and either way he didn't do a bad job. You are right though that everybody should do research before diving in, that's never bad advice.
-m