Have I missed something definitive here?
The Citi letter attached to the September card statement defining Eligible Transactions may not have changed (I don't recall the $10,000 in credit) though strongly doubt Citi are highlighting the Condition unless they intend taking action effective 1 November.
I would have a difficult case arguing against any "transactions made in operating a business", unlike Westpac which allows some business spend. Citi back in 2010 swiped my account for six figures clawing back some of the booty their systems had allowed me to earn over the 150K annual points barrier on my then Platinum card. I want to make sure they don't get their hands on a 7 figure haul this time.