Have those pages got different adresses to be somewhere else in the site or are completely removed and cant access them in any way? I’m speaking about the page for each unit for all 3 races where you can see the lore and many other details about each unit starting with the zerg drone i.e. and moving towards the endgame units such as the viper or ultralisk.
Negative, its gone unfortunately. It was in the old site but that is gone and unavailable as it stands.
The closest places to find it is IGN that has somewhat preserved some of it and Starcraft 2 Wikia which is a bit hard to navigate at first.