Following the history here, DARPA also funded work in ~2005 on a project Monarch, that I saw presented at a Google tech talk back then. I believe it refers to the "butterfly" architectures of very scalable interconnects of lightweight processing units

Bill Dally was working on the networking side (maybe equiv to the photonics interconnect here) and almost got it up and running at BBN (search for "monarch") http://franki66.free.fr/Principles%20and%20Practices%20of%20...

Here's some refs for the chip https://slideplayer.com/slide/7739558/ https://viterbischool.usc.edu/news/2007/03/monarch-system-on...

6 main RISC processors with 96 ALUs for the lightweight IO/compute processes

Their multithreaded cores are similar design, yes. It does not do XMT's in-hardware full/empty bit memory access system though.