Hi, I’m happy to hear the migration process worked just like that!
If you want to go SD-less, you have to switch over to the eMMC. For this, you need to switch the little DIP switch on the i.MX8M SOM. This is a bit tricky because you need to remove the heatsink to reach the switch. Putting the heatsink back on with the little plastic spacers requires a bit of patience. But yeah, all you need to do is flip the switch, boot without the SD card (you will end up in the Rescue System). There, do reform-boot-config nvme once again.