There’s a lot I like about this article, however I believe the key is not knowing how to do ‘x’, it’s knowing why.
Form designs are a great measure of ones user experience knowledge, however the key is knowing the applicant knew the reasons behind their decisions.
For instance, this article recommends a single column layout yet this isn’t always the global rule. An interface with a landscape resolution which is viewed from a distance, such as a Television UI, where the user reads from left to right and the intention is to slow their progress, a multi-column layout would be more appropriate. And it’s this consideration where we can judge ones user experience knowledge; their thought process, not their output.