The article's goal is clearly to provide a quick categorisation of the TODO, rather than require reading the description to discover it: if I'm trying to debug something and reach a bit of code with a bunch of TODOs it's not going to help me much, if I see a FIXME or BUG I'm going to be a lot more interested.
Sometimes the TODO us sufficient through it context (e.g. a docstring empty but for a TODO stanza is obviously a missing doc), but often it's not and is the documentary equivalent of a goto.
The article's goal is clearly to provide a quick categorisation of the TODO, rather than require reading the description to discover it: if I'm trying to debug something and reach a bit of code with a bunch of TODOs it's not going to help me much, if I see a FIXME or BUG I'm going to be a lot more interested.
Sometimes the TODO us sufficient through it context (e.g. a docstring empty but for a TODO stanza is obviously a missing doc), but often it's not and is the documentary equivalent of a goto.