I read the article and it sounds like this guy is debugging and QCing by submission. He sounds like a sloppy programmer. Microsoft rejected his app and gave him the technical reasons why. He failed two more resubmissions. The first two comments on his blog sum it up nicely:
"We had the opposite experience. We ported a complex WP7 XNA game to Windows 8. We got invited to the App Excellence Lab. We won an early access token. We submitted to the store in July and passed on the first try. To date we've submitted to the store 3 times and passed all three times."
"Makes me wonder if his code is very inefficient"
Personally, I'm glad they are rejecting apps that don't work or perform as required.