You would use a 'fake' container for safe work that you don't mind revealing, while only entering your 'secret' container only when, and alway when, doing work you want to keep secret. This way. there isn't really any 'fake' data, just different data.
Truecrypt didn't generate fake date, you (the user) did. E.g. put porn on "show to thugs" partition and "Death star plans" on "true" encrypted partition.
Poop porn? Also, besides keeping that, and starting VLC muted in the background from time to time to keep plausibility, you would use the porn tainted partition for your everyday stuff. Hacker news, etc.