Am I the only one having a hard time relating the title of the submission with the content of the article?... In fact, what was the content of the article? Postgres lacks in-place upgrades while competitors have it?

Did you read the linked presentation? http://www.commandprompt.com/files/mysql_learn.pdf

You're not alone - it seems the content of the article was exactly the opposite of the title.

Article does not match description at all. If anything, it's what PostgreSQL can learn from MySQL.