Interesting video. Well made. The reasoning behind this is highly debatable. I could write pages about what's right and wrong about what's said in the video as well as in the comments, but I don't think that's appropriate. In short I'd say the chance of us being here can be any number from 0 up to and including 1. It just depends on how you look at it. I know that seems like a cop out, but it's basically what it boils down to. If you want me to send a PM to explain myself better, please let me know.
ps evolution theory "IS just a theory" is a false statement because a "scientific theory" is something else than what is commonly meant by "theory". The definition of "scientific theory" according to the national academy press is "a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment." Newton's law of universal gravitation is also "just a theory", yet no one ever says "Gravity may not exist, because it's just a theory.".