I think you are correct.
Certainly with the bot I tested (anarki) he dodged much more with thinktime 0 as opposed to thinktime 100, or even thinktime 1.
Also there was a command for disabling bot chat.
Legend is russian spiterbot mod for quake 3 OSP. No problem with bridge to rail jump in dm6 + close to 90% aim and some timing = lot of players could NOT beat him ;)