A topic that has been updated has had material added or changed or corrected. That particular text is of course correct and accurate, as of the date updated, but the rest of the topic has not been reviewed. The normal case for a topic getting an "Updated" tag is that material from the A-Shell Development Notes has been added. However, that does not mean that the rest of the topic has been reviewed for accuracy, completeness or relevance. If you see the "Reviewed" tag, then the material is known to be accurate; otherwise, it is not known to be completely up to date.