Yes, it is disappointing that you did not even get an acknowledgement from IR.
Megachips evidently played a large part in the design of AKD1500.
Brainchip announced the M.2 card was available in January 2025. The NAIST article was published 22August'24.
I would not be surprised if Megachips did an about face and decided to use M.2 cards for demo models. That way an upgrade to AKD1500 is simple and later it could be upgraded to AKD2500 chips when they are available.
That way Megachips then have the option of a contract for volumes or a license and can chose when if ever they wish to take out a license.
Growth demand for robotics in Japan will likely play a part in license timing.
It is evident that NAIST was developing Algorithms with AKIDA1000 when the article see link below was published on 22nd Aug'24. Megachips at that stage would be locked into using AKIDA given Demo robotics was on display in September 2025.
Just my take on it.