I don't know why, but I find it really amusing that articles about tf2 still use screenshots from the beta (iirc that muzzle flash particle effect on Heavy's gun was only in TF2's beta)
This always happens. The first pre-release screenshots are the ones with the most views so tend to appear at the top of Google searches. Guaranteeing them to be used in most news stories for years to come. Which gives them more views. Which gives them a higher Google rank. Etc...