That is pretty much true of all Tesla packs. There are some serviceable parts under the "penthouse" cover, but if any cell goes bad in any Tesla pack your only choice is to replace the entire pack. (Well Elon mentioned in the past that you might be able to replace all of the battery modules in a Model 3 pack, just keeping the electronics and enclosure, but I doubt that will make a huge cost difference.)It looks like your screwed if 4680 cells go bad. There is no fixing a Structural pack, all you can do is replace it.
Yeah - I was a little shocked, but this seems to lead in the direction that the only servicing of 4860 packs will be total-pack-replacement. Maybe Tesla itself will take packs back for recycling of cells into new/refurb packs.
Yes, Tesla recycles failed packs. Though they have said that there isn't enough failed packs to do much yet.