My interpretation of promote here is that as long as nuclear technology is used, it's used safely and helping the world become a better place. This is in contrast to using nuclear technology as weapons. But, focusing on just that one word is prone to mis-interpretation so better would be to study their mission a bit more, and more so what they actually do.
It's worth noting that one of their primary goals is nuclear safety, which is something a large part of their efforts are spent on.
I couldn't find a single politician in the membership list. There were 156 member states.