Please update the section on storage classes. Auto is no longer a storage class, but a keyword for automatic type deduction. Also, register has recently been deprecated as well, if I remember correctly.
This appears to be a C++03 guide, as it doesn't mention any C++11 features (no range based for). To be fair it is definitely a "quick" guide, and doesn't cover enough to actually be productive in C++ (pointers\memory allocation and references are missing...), but you're right that auto and register are the only things that appear to be explicitly wrong, instead of wrong by omission.
Well probably it would be sufficient to write simple programs. But maybe this guide is just too quick in that it just covers some basic syntax but leaves out a lot of goodies which actual programs use (no containers/algorithms at all, indeed no C++11 and beyond which is imo a shame for any recent C++ guide - there's not even any mentioning of it), doesn't adhere to current best practices (take 'double getVolume(void)': void argument has no place in C++ and should arguably be const, no error checking on stream methods) and seems too lack crucial information (no mention of heder files, no mention of how to get the samples compiled).