Distrowatch.com is a site promoting use of Linux and BSD.
"eject" is a Linux command which attempts to safely disconnect removable media.
https://manpages.ubuntu.com/manpages/noble/en/man1/eject.1.h...
TFA doesn't mention filesystems at all, sort of jumps in where we find the block device. Things could become messy if the device were mounted while the copy is attempted.