This thread is referencing if the SSD fails. If the SSD fails, the computer won't turn on, and even if it could (which we wish were the case, but the T2 chip prevents), you couldn't use get anything off the disk because it's a dead SSD.
In the event of an OS crash/issue, or just minor corruption, that might be an option. Related to the original article -- I'm not sure what is meant by DFU mode on a MacBook (only have heard of that on iDevices) so it's unclear to me if you can EFI boot into another OS. Given that it also affects Asahi Linux, sounds like you can't EFI boot into anything, even OS Recovery for Mac Sharing mode.
There is no EFI on Apple Silicon. It's a more iOS-ish pre-boot environment (based around iBoot and some other Apple-y things).
There's also not exactly a boot picker in firmware-- that lives in the recovery OS. Which will also be unbootable if you're impacted by this issue because it's a minimal macOS environment; if your only OS is 13.6/13.6.1, that recovery partition will also be 13.6/13.6.1, and, if you have upgraded to 14.0/14.1, that installer can fail to update the recovery partition and leave it at 13.x (whatever you were on when you upgraded).
The architecture of Apple Silicon Macs is shared with iPhones and iPads and there isn’t an EFI environment. DFU mode on a Mac works the same as an iPhone and lets you restore from another computer.
