Then 0% chance of an aircraft sub. As you've no doubt figured out, white is for unoccupied seats.
Your flight is only selling 6 more J seats. Rows 6,7,8 are empty at the moment.
so with 3.5 weeks to go, it could sell out. I wondered if one of the rows was vacant, I'd ask for a change at the airport. AS it is,I have a row 1 seat for mobility reasons. In any case it's not the end of the world. It'll still be the most comfortable LH flight I've taken as an adult