You say "style", and you're very close to the mark. These guys are lawyers. Fraud has a particular legal definition. Rand and others refer to the illegality and unconstitutional processes that were changed and followed. This is equivalent to a layperson saying "fraud", but these use different words because -

It's important to these people that the correct words are used to hold people accountable, because it changes the required evidence for proving the case. Proving "fraud" is different than proving constitutional process wasn't followed.