If SpaceX can really pull that off, my math above would look a lot different.
True. But this relies a lot on software and probably some specialized details in hardware as well
Your Dragon docking maneuvering requires way less calculations than your typical AI training. Hence it is ok to have HW do the same calculation multiple times and check the values.
This is different from AI training where you want the most reliability 24h/day
Another aspect that is entirely missing from that pdf that doesn't necessarily convince me these people have a plan.