All the switches in this series except the one in this review actually have two separate boards inside with a PCIe-over-cable connection between them. For example the SN2700 here (the sleeved cable in the third photo; you can't see the connector from the angle it's taken from):
AFAIK DPUs are only ~$2,000 but if you put one in each server it adds up to far more money than a traditional network. They're really not intended to replace TOR switches.
No need to have switches and servers in your rack anymore, every server is a switch and every switch is a server with a 192 threads CPU. Insane.