No you are twisting it.
OLD LIGHT: You must be a baptised JW and righteous to survive Big A, everyone else dies at Big A and all unrighteous who died prior to Big A (unless like Hitler etc) get resurrected.
NEW LIGHT: All baptised JW's and righteous JW's survive Big A and some who may not be JW's but have a righteous heart may survive the Big A, all unrighteous who dies prior to Big A (unless like Hitler etc) get resurrected.
The difference is now they say officially some may not be a baptised JW but have the right heart and pass through the Big A and hence not necessary to HAVE to die before the Big A to survive it.
But the key criteria is Jehovah sees their righteous heart and that they would be a good subject.
That does not mean billions pass through the Big A. They simply changed the criteria from having to be a baptised JW to one who Jehovah sees their heart as righteous.