Yes, but EMC doesn't do that level of storage. For HPC, Dell resells various hodgepodges of their servers running Lustre (or rarely GPFS) with JBOD or cheesy RAID for the disks themselves.
I understand that, because those are basically the only filesystems anyone could use for this application. The comment was aimed at the "various hodgepodges of their servers ... with JBOD or cheesy RAID for the disks themselves" part.
But Isilon is purely NFS (and/or SMB/CIFS) and doesn't support the parallel access that GPFS or Lustre do. It's not really a choice for this workload. Plus it'd be a lot more expensive than HPC storage - enterprise level RAS (reliability, serviceability, availability) costs. I've seen comparable capacity Isilon & DDN quotes (w/GPFS or Lustre) and they're worlds apart.