Walkthroughs for custom maps.

Well, I'm not an expert on good maps. But somehow, it seems that BioBob contributed a significant amount of original content to the map. Where did this understanding of the elemental bug, explosion bug, etc., come from? I don't think that 99% of players were aware of all the features that are used in the Metataker walkthrough. And the author himself – did he compile a bunch of bugs, or did he actually find/play them out multiple times?