According to stty(1), ”cbreak” is a negative alias of “icanon”, which simply enables the special functions of the ‘erase’ (backspace), ‘kill’ (Ctrl-U), ‘werase’ (Ctrl-W), and ‘rprnt’ (Ctrl-R) keybindings. “cooked” mode includes “icanon”.

So no, I do not think that what you wrote is correct. From what I can tell, the line-by-line mode is “extproc”.