Iowa's power is entirely in it's PR generation as being first ... it's actually delegate count is poultry and insignificant. So they don't have to cheat Bernie out of the eventual win, or even tamper with any votes, to essentially make him lose by denying him the PR spoils of winning.
It's the usual democrat confluence of plausibly deniable coincidences and so called glitches (new name!: 'coding problem) that just happen to all benefit one agenda in one direction.