Yes, that BK provision pertains to luxury goods bought on credit
that aggregate more than $500 incurred within 90 days of the bankruptcy.
If you paid cash, then that doesn't apply. Although if you did purchase a big-ticket item with cash, you might have to list it as an asset - but then I'm sure you could use your state's exemption to exempt it.
I wouldn't worry at all. Even if you did purchase luxury goods within 90 days, you can still file your BK. The worst case scenario is that the creditor objects to dischargeablility, wins, and you have to end up paying the creditor back for those goods. (Most credit cards are not even going to send their attorney in to object to dischargeability).
Personally, I've had customers take out a $1000 loan and file bankruptcy before their first payment was due. My attorney said it would be too difficult to prove the loan proceeds were used on luxury goods, and that the legal expenses in trying to fight it would outweigh the amount owed, so it wasn't feasible for us to even try to make an argument in court.