While a bit weirdly put, I believe the first lines were meant to state the fact (there's randomness in the game modes), while his idea was to influence the odds of different modes through doctrines. While an interesting idea, I don't think I'm in favour of it.
There wont be anything in the doctrines that affects the gametype, the doctrines are a representation of your individual company growth only.
There will be things on the warmap that do however.