I doubt that a little rephrasing would make a difference if it’s just “no, really follow the instructions”.
It would be better to point out the important part. But then it would make this part of the instructions device specific.
Maybe it would help more to add something to the already device-specific text. Like
“Hint: if fastboot -w outputs an error when fastboot flashing unlock did not and you are on Linux, please install the android tools from the Android Software Development Kit instead of your distribution packages following this part of the setup instructions.”
Yeah, or both, the little rephrasing and the specific hint.