Have you played the e3demo map? Like PhysTown or something like that? I heard all that AI shit they talked about (Like "Yaeh, our AI will learn and react") was just a bunch of scripted events put together for E3
VALVe never said anything about what events were scripted and what events weren't. At any rate it was a demo, maybe they weren't done with the AI yet but knew how it was going to turn out, and wanted to convey that E3. A lot of tech demos are smoke and mirrors, afterall, if the game was finished it would be released.
I don't think anyone should be making assumpions or judgements about a build of the game stolen from VALVe that probably wasn't even ready for private QA, let alone public consumption.