If you have upgraded to Arduino CLI version 0.11 you can no longer flash any applications from Edge Impulse. This seems to be because a flag to specify which binary should be flashed was removed by Arduino, and there seems to be no equivalent. We’ve filed an issue here: https://github.com/arduino/arduino-cli/issues/764 and hope to resolve this asap.
This has now been resolved, but you’ll need to upgrade to v0.11 of the Arduino CLI (an error is now thrown with upgrade instructions if you’re still on an older version).