lsblk doesn’t show mmcblk0, mmcblk2 exists

I am trying to install devsus on an ASUS C201 laptop. I have successfully installed on an external USB, but am trying to install to the internal laptop memory. The instructions direct me to dd the 16GB image onto mmcblk0, however lsblk shows only an mmcblk2, mmcblk2boot0, mmcblk2boot1, and mmcblk2rpmb. I have dd the image onto mmcblk2, which has definitely done something as it no longer boots into chromeOS when I boot from the internal media, however it doesn’t boot devsus and instead puts me in a recovery mode which requires external media for recovery.

Should I be looking for an mmcblk0, or is mmcblk2 the correct target?
Given that the external USB does boot, is there a way to dd that onto the internal memory, and then perhaps re-partition it to use the full internal disk?