No problem, Brym.  And keep in mind that for business applications and implementation issues, if you running into problems using any of the Coral products, you can always contact our support team and exchange with someone there, and our support experts and our field engineers will try their best help you.
For your business solutions and projects, one of the partner listed on our site Upverter offers host board design tools and services, and one of the solutions they offer is to help customers making CM4 working with the Coral Accelerator module with the USB interface, if that ever becomes a solution you’d need to consider.  Although, we generally recommend just using the standard PCIe interface with the SoC on host board for the best ML performance and data throughput speed.
Best of luck to your projects, personal or business. Have fun!
Bill