Great article with lots of valuable info in there. The part about the actual whiteboard is almost irrelevant. Most of the comments here are getting too worked up about that.

"Learn Python and use it during your interview." Python is expressive, a high level and kind of writes like pseudo code. Just write pseudo code. The point isn't syntax anyways.

"The highest value problems I know of are on Project Euler." I do enjoy running through Project Euler problems but I have no evidence that's making me better at my day job, only better at answering Project Euler problems.