I think they are just delaying the broadcast of the episodes. I imagine the studio staff are still making them. I doubt their busy schedules could support stopping production because of this incident.^Sorry this is somewhat off topic^
I'm really happy with David Productions choice to delay Fire Force over these recent events, not only out of respect for KyoAni and their staff
But I think its very important for their staff mentally as well. I couldn't imagine what its like trying to work on a show with similar [themes]. Hopefully they're not pushed to meet deadlines over the next few weeks and their staff have people to talk to when needed
The episodes will probably be produced, and just put in a queue so they'll air weekly once the delay is over.