Possibly. You’re right that there is some vague wording. There have been occasions in the past where raids/guilds have been suspended for exploiting bugs with particular mechanics.
In the Eula, the section under Cheating states:
“You are responsible for how you and your account are represented in the game world. Cheating in any fashion will result in immediate action. Using third-party programs to automate any facet of the game, exploiting bugs, or engaging in any activity that grants an unfair advantage is considered cheating.”
And while it isn’t clear whether that’s an activity that grants an unfair advantage, there’s a bit of a warning at the bottom:
“If you’re unsure if your actions violate this code of conduct, reconsider them. We reserve the right to restrict offending accounts as much as necessary to keep Blizzard games a fun experience for all players.”