Although i hated IE for years when i was developing front end stuff back in the day i must say this is a pure publicity stunt.
The whole purpose of the article was to get some traffic on the site. It's a well known fact that web devs (their core cutomers) hate IE, so it's an easy and cheap way to get their attention - some of them will check out the app and maybe become customers.
disclaimer: i'm involved in a company that makes a time tracking app and we fully support IE.