ReadyTIER log message...problem?

...and after recreating a brand-new volume with only the spinning disks in RAID5, allowing it to fully sync and running successful disk checks on all disks...

It went read-only and then completely down again.  This time I may not be able to get it back.  Mounting it says there's a bad superblock, but btrfs rescue super-recover says "All supers are valid, no need to recover".  Mounting with -o recovery,nospace_cache,clear_cache says "wrong fs type, bad option, bad superblock on /dev/md127.  btrfs rescue zero-log says "ERROR: incorrect offsets 24187 2658730369", btrfs check /dev/md127 says the same thing.

Whatever data I manage to recover, this unit is getting powered down and is going on a shelf or into the recycle bin.  I can't afford the time this is costing me, not to mention the data I'm probably going to lose...terabytes of archival material that cannot be replaced.  I'm angry enough that I want to use language that would not be approved here.  Note:  these drives are very new, and check out 100% okay...according to your own diagnostics.  Maybe I shouldn't trust those either, eh?

If anyone from Netgear wants to log in and look at it, I will turn on remote diagnostics while I still have it powered up, but note that this won't be for long...only until the point that I give up trying to get data back.  Once I'm done with that, it's all over.